Current through Register 1531, September 27, 2024
(1)
Aisle. Clearance of all aisles shall be 12 inches or
greater.
(a) The seat backs shall be slanted
sufficiently to give aisle clearance of 15 inches at tops of seat
backs.
(b) At all times, the aisle
shall be unobstructed by any barrier or seat.
(2)
Back Up Warning
Alarm. An automatic audible alarm shall be installed behind the
rear axle and shall comply with published Backup Alarm Standards (SAE J994B),
providing a minimum of 112 dBA.
(3)
Battery Carrier.
(a)
Batteries mounted within the engine compartment must be secured to prevent
dislodging in the event of vehicle upset or roll over.
(b) Batteries mounted outside the engine
compartment shall be in a closed, drained, weather tight and vented compartment
in the body skirt; be readily accessible from the outside for convenience of
servicing; and be secured to prevent dislodging in the event of vehicle upset
or roll over.
(4)
Child Reminder System. The child reminder system must
include an audible device that must be disengaged by the driver before leaving
the vehicle. The child reminder system shall be installed on all school buses
model year 2018 or newer. The child reminder system control shall be located in
the rear most seating compartment.
(5)
Construction.
Must meet Federal Motor Vehicle Safety Standards for School Bus
Construction.
(6)
Signage and Reflective Material. Effective August 20,
1997, every school bus shall display a sign located below the rear window of
the bus which reads "unlawful to pass when red lights are flashing." The sign
shall have black letters not less than four inches nor more than six inches
high on a white reflective background. Alternative signage and reflective
material must be approved by the Registrar. Other reflective material may be
installed on the bus, provided it is of automotive engineering grade or better,
meets initial reflectance values in FHWA FP-85 and retains at least 50% of
those values for a minimum of six years. Reflective materials and markings may
include:
(a) Rear of bus body: may be marked
with a strip of reflective National School Bus Yellow material no greater than
two inches in width to be applied to the back of the bus, extending from the
left lower corner of the "SCHOOL BUS" lettering, across to left side of the
bus, then vertically down to the top of the bumper, across the bus on a line
immediately above the bumper to the right side, then vertically up to a point
even with the strip placement on the left side, and concluding with a
horizontal strip terminating at the right lower corner of the "SCHOOL BUS"
lettering.
(b) "SCHOOL BUS" signs:
may be marked with black letters on a reflective National School Bus Yellow
material comprising background for lettering of the front and/or rear "SCHOOL
BUS" signs unless equipped with a lighted sign.
(c) Sides of bus body: may be marked with
reflective National School Bus Yellow Material at least two inches but not more
than 12 inches in width, extending the length of the bus body and located
(vertically) as close as practicable to the beltline.
(d) Effective June 1, 2004, any bus entering
service in the Commonwealth of Massachusetts shall display a sign that states
"Bus Stops at all R/R Crossings."
Such sign shall:
1. Be
of reflective white material.
2.
Shall be black letters of four inches minimum height.
3. Sign shall be 36 inches in length placed
on the rear bumper.
4. Alternative
signage must be approved by the Registrar.
(e) Front bumper: May be marked diagonally 45
E down the centerline of pavement with a two-inch wide strip of non-contrasting
reflective material (see FHWA FP-85 Appendix).
(7)
Defrosters.
(a)
Defrosters and defogging equipment shall direct a sufficient flow of heated air
onto the windshield, the window to the left of the driver and the glass in the
viewing area directly to the right of the driver to eliminate frost, fog and
snow.
(b) The defrosting system
shall conform to Society of Automotive Engineers Standards J381 and
J382.
(c) The defroster and
defogging system shall be capable of furnishing heated outside ambient air,
except to that part of the system furnishing additional air to the windshield,
entrance door and stepwell may be of the recirculating air type.
(d) Auxiliary fans are not considered
defrosting or defogging systems.
(e) Portable heaters may not be
used.
(8)
Service Door.
(a) The
service door shall be in the driver's control, designed to afford easy release
and to provide a positive latching device on manual operating doors to prevent
accidental opening. When a hand lever is used, no part shall come together that
will shear or crush fingers. Manual door controls shall not require more than
25 lbs. of force to operate at any point throughout the range of operation, as
tested on a 10% grade both uphill and downhill.
(b) The service door shall be located on the
right side of the bus opposite the driver and within the direct view of
driver.
(c) The service door shall
have a minimum horizontal opening of 24 inches and a minimum vertical opening
of 68 inches. Type A vehicles shall have a minimum opening area of 1,200 square
inches.
(d) The service door shall
be split, sedan, or jack-knife type. (Split type door includes any sectioned
door which divides and opens inward or outward.) If one section of split type
door opens inward and the other opens outward, the front section shall open
outward.
(e) Lower, as well as
upper door panels shall be of approved safety glass. The bottom of the lower
glass panel shall not be more than ten inches from the top surface of the
bottom step. The top of the upper glass panel shall not be more than three
inches from top of door. Type A vehicles shall have the upper panel (window/s)
of safety glass with an area of at least 350 square inches.
(f) The vertical closing edges on split type
or folding type entrance doors shall be equipped with flexible material to
protect the passengers' fingers. Type A vehicles may be equipped with chassis
manufacturer's standard entrance door.
(g) There shall be no door to the left of the
driver on Type B or D vehicles. Type A and C vehicles may be equipped with
chassis manufacturer's standard left-side door.
(h) All doors shall be equipped with padding
at the top edge of each door opening. The pad shall be at least three inches
wide and one inch thick and extend the full width of the door
opening.
(i) On power-operated
service doors, the emergency release valve, switch or device to release the
service door must be placed above or to the immediate left or right of the
service door and clearly labeled.
(9)
Emergency Door.
The emergency door shall be hinged on its right side if in the rear end of bus,
and on its front side if on the left side of bus. It shall open outward and
shall be labeled inside to indicate how it is to be opened. If double emergency
doors are used on Type A vehicles, they shall be hinged on the outside edge and
shall have a three-point fastening device. A device shall be used to hold the
door open during emergencies and school bus evacuation drills. When the release
mechanism is not in the position that causes an emergency door to be closed and
the vehicle's ignition is in the "on" position, a continuous warning sound
shall be audible at the driver's seating position and in the vicinity of the
emergency door, as required by
49
CFR 571.217. When the release mechanism is
not in the position that causes an emergency door to be closed and the
vehicle's ignition is in the "on" position, emergency doors shall be identified
by a red light which shall be lighted as required and readily visible to
passengers.
(a) The upper portion of the
emergency door shall be equipped with approved safety glazing, the exposed area
of which shall be not less than 400 square inches. The lower portion of the
rear emergency door on Type B, C and D vehicles shall be equipped with a
minimum of 350 square inches of approved safety glazing.
(b) There shall be no steps leading to the
emergency door.
(c) The words
"EMERGENCY DOOR" both inside and outside in letters at least two inches high,
shall be placed at the top of or directly above the emergency door or on the
door in the metal panel above the top glass.
(d) The emergency door shall be equipped with
padding at the top edge of each door opening. The pad shall be at least three
inches wide and one inch thick and extend the full width of the door
opening.
(e) The side emergency
door, if installed, must meet the requirements set forth in FMVSS 217 S5.4.2.1,
(b), regardless of its use with any other combination of emergency
exits.
(f) There shall be no
obstruction higher than 1/4 inch across the bottom of any emergency door
opening.
(10)
Emergency Exits.
(a)
For school bus bodies and chassis placed in production after August 31, 2004,
Type A, B, C and D vehicles shall be equipped with emergency exits in the
following capacity vehicles:
one to 42 Passengers = one emergency exit per side and one roof
hatch
43 to 78 Passengers = two emergency exit per side and two roof
hatches
79 and above Passengers = three emergency exits per side and
two roof hatches
(b) On
buses manufactured after August 31, 2004, there shall be no seating position
located at or adjacent to the side emergency door.
(c) In addition to side and rear emergency
exits, doors, or windows, one or more roof hatches may be installed, provided
they meet all requirements specified in
49
CFR 571.217.
(d) For all buses entering service after
August 31, 2004, emergency windows shall be hinged vertically on the forward
side.
(11)
Floor. The floor in the underseat area, including tops
of wheelhousing, driver's compartment and toeboard, shall be covered with
rubber floor covering or equivalent having minimum overall thickness of 1/8
inch.
(a) Floor covering in the aisle shall
be of the aisle-type rubber or equivalent, wear-resistant and ribbed. Minimum
overall thickness shall be
3/16 inch measured
from the tops of the ribs.
(b)
Floor covering must be permanently bonded to the floor and must not crack when
subjected to sudden changes in temperature. Bonding or adhesive material shall
be waterproof and shall be of a type recommended by the manufacturer of
floor-covering material. All seams must be sealed with waterproof
sealer.
(12)
Heaters. Heaters shall be of hot-water or combustion
type.
(a) If only one heater is used, it
shall be of fresh-air or combination fresh-air and recirculating
type.
(b) If more than one heater
is used, additional heaters may be of recirculating air type.
(c) The heating system shall be capable of
maintaining bus interior temperatures as specified in SAE Test Procedure
J2233.
(d) All heaters installed by
body manufacturers shall bear a name plate indicating the heater rating in
accordance with School Bus Manufacturers Institute Standard No. 001. The plate,
as affixed by the heater manufacturer, shall constitute certification that the
heater performance is as shown on the plate.
(e) Heater hoses shall be adequately
supported to guard against excessive wear due to vibration. The hoses shall not
hang or rub against the chassis or sharp edges and shall not interfere with or
restrict the operation of any engine function. Heater hoses shall conform to
Society of Automotive Engineers Standard J20c. Heater lines on the interior of
the bus shall be shielded to prevent scalding of the driver or
passengers.
(f) Each hot water
system installed by a body manufacturer shall include a shutoff valve installed
in the pressure and return lines at or near the engine in an accessible
location, except that on all Type A and B buses, the valves may be installed in
another accessible location.
(g)
For Type B, C and D buses there shall be a water flow regulating valve
installed in the pressure line for convenient operation by the driver while
seated.
(h) All combustion type
heaters shall be approved by Underwriters Laboratories, Inc. and shall be in
compliance with current Federal Motor Carrier Safety Regulations.
(i) Accessible bleeder valves shall be
installed in an appropriate place in the return lines of body company-installed
heaters to remove air from the heater lines.
(j) Heater motors, cores and fans must be
readily accessible for service. Access panels shall be provided as
needed.
(13)
Identification. No signs or lettering shall appear on
the front, back or sides of the bus, other than those specified in M.G.L. c.
90, § 7B and those required or permitted by
540 CMR 7.00, but the rated
seating capacity and the owner's name shall be displayed. The designated
seating capacity shall be displayed on the right side, to the left of the
service door in two inch letters. Owner/Operator information shall be displayed
on both sides of the bus in two inch letters or greater. The seating capacity
and the owner's telephone number may also be displayed as specified above. The
company bus number shall be displayed on the left and right sides and rear of
the bus, said numbers and lettering to be not less than four inches in height
and not less than 1/2 inch in stroke. The company bus number shall be
displayed on the roof of the bus left to right, said numbers and lettering to
be not less than 24 inches in height and not less than eight inches in stroke.
The body and chassis manufacturer's trade name may be displayed if applied by
the manufacturer. The Registrar in his or her discretion may authorize in
writing such other markings as deemed appropriate.
(14)
Inside Body
Height. The inside body height shall be 72 inches or more,
measured metal to metal, at any point on longitudinal center line from the
front vertical bow to the rear vertical bow.
(15)
Insulation. The
ceiling and walls shall be insulated with proper material to deaden sound and
to reduce vibration to a minimum. If thermal insulation is used, it shall be of
fire-resistant material of a type approved by Underwriters Laboratories, Inc.
If floor insulation is required, it may be five-ply, at least e
inch thick, or it shall equal or exceed properties of exterior type softwood
plywood, C-D Grade, as specified in standard issued by the United States
Department of Commerce. If plywood is used, all exposed edges shall be
sealed.
(16)
Interior. The interior of the bus shall be free of all
unnecessary projections likely to cause injury and shall be kept clean. This
standard requires inner lining on ceilings and walls. If the ceiling is
constructed to contain lapped joints, the forward panel shall be lapped by the
rear panel and exposed edges shall be beaded, hemmed, flanged or otherwise
treated to minimize sharp edges.
(a) The
driver's area forward of the foremost padded barriers must permit the mounting
of required safety equipment and vehicle operating equipment.
(b) Every school bus shall be constructed and
maintained so that the noise level taken at the ear of the occupant nearest to
the primary vehicle noise source shall not exceed 85 dBa when tested according
to the procedure found in the School Bus Manufacturers Institute School Bus
Design Objectives, January, 1985.
(17)
Lamps and
Signals. Interior lamps shall be provided which adequately
illuminate the aisle and stepwell. Body instrument panel lights shall be
controlled by a rheostat switch.
(a) School
bus alternately flashing signal lamps shall comply with all applicable
provisions of United States Department of Transportation Motor Vehicle Safety
Standard - 108 (
49
CFR 571.108) , and the applicable provisions
of M.G.L. c. 90, § 7B. Such lamps must also be equipped with a continuous
warning signal, readily audible or visible to the driver in the event that any
of the lamps are inoperative. A monitor board shall be utilized for this
purpose.
(b) The area around the
lens of each alternately flashing signal lamp and extending outward
approximately one to three inches shall be painted black. In installations
where there is no flat vertical portion of body immediately surrounding the
entire lens of lamp, a circular or square band of black approximately one to
three inches wide, immediately below and to both sides of the lens, shall be
painted on the body or roof area against which the signal lamp is seen (from
distance of 500 feet along the axis of the vehicle). Visors or hoods with an
appropriate black background to fit the shape of hoods/visors and roofcap may
also be used.
(18)
Turn Signal and Stop/Tail Lamps. Bus bodies shall be
equipped with rear turn signal lamps which are at least seven inches in
diameter or if not round, a minimum of 38 square inches of illuminated area,
and which meet the specifications of the Society of Automotive Engineers. These
signals must be connected to the chassis hazard warning switch to cause the
simultaneous flashing of turn signal lamps when needed as vehicular traffic
hazard warning. Turn signal lamps are to be placed as wide apart as practical
and their centerline shall be approximately eight inches below the rear
windows. Type A conversion vehicle lamps must be 21 square inches in the lens
area, and be in Manufacturer's Standard Color.
(a) Buses shall be equipped with four
combination red stop/tail lamps. Two combination lamps with a minimum diameter
of seven inches or, if not round, a minimum of 38 square inches of illuminated
area, shall be mounted on the rear of the bus just inside the turn
signals.
(b) Two combination lamps
with a minimum diameter of four inches or, if not round, a minimum of 12 square
inches of illuminated area shall be placed on the rear of the body between the
belt line and the floor line. The rear license plate lamp may be combined with
one lower tail lamp. Stop lamps shall be activated by the service brakes and
shall emit a steady light when illuminated. Type A buses with bodies supplied
by the chassis manufacturer may have manufacturer's standard stop and tail
lamps.
(19)
Metal Treatment. All metal used in the construction of
a bus body shall be zinc coated or aluminum coated or treated by an equivalent
process before the bus is constructed. This includes such items as structural
members, inside and outside panels, door panels and floor sills. Excluded are
such items as door handles, grab handles, interior decorative parts and other
interior plated parts.
(a) In addition to the
above requirements, all metal parts that will be painted shall be chemically
cleaned, etched, zinc-phosphate-coated and zinc-chromate or epoxy primed or
conditioned by equivalent process.
(b) In complying with these requirements,
particular attention shall be given to lapped surfaces, welded connections of
structural members, cut edges, punched or drilled hole areas in sheet metal,
closed or box sections, unvented or undrained areas and surfaces subjected to
abrasion during vehicle operation.
(c) As evidence that 540 CMR 7.05(18)(a)
requirements have been met, samples of materials and sections used in the
construction of a bus body, when subjected to 1,000-hour salt spray test, as
provided for in latest revision of American Society For Testing And Materials
Standard B-117 "Standard Method of Salt Spray (Fog) Testing", shall not lose
more than 10% of material by weight.
(20)
Mirrors.
(a)
Interior Mirror.
Shall be either clear view laminated glass or clear view glass bonded to a
backing which retains the glass in the event of breakage. The mirror shall have
rounded corners and protected edges. Type A bus shall have a minimum of a six
inch x 16 inch mirror, and Type B, C and D buses shall have a minimum of a six
inch x 30 inch mirror.
(b)
Exterior Mirror. Each school bus shall be equipped
with a system of exterior mirrors (as defined in FMVSS No. 111).
1.
Rear Vision
Mirror: The mirror system shall be capable of providing, along the
left and right sides of the vehicle, the driver with a view of the rear tires
at ground level, a minimum distance of 200 feet to the rear of the bus and at
least 12 feet perpendicular to the side of the bus at the rear axle
line.
2.
Crossview
Mirror System. The crossview mirror system shall provide the
driver with indirect vision of an area at ground level from the front bumper
forward and the entire width of the bus to a point where the driver can see by
direct vision. The crossview system shall also provide the driver with direct
vision of the area at ground level around the left and right front corners of
the bus to include the tires and service entrance on all types of buses to a
point where it overlaps with the rear vision mirror system.
3. This system of mirrors shall be easily
adjustable but be rigidly braced so as to reduce vibration.
(21)
Mounting. Chassis frame shall support rear body cross
member. Except where chassis components interfere, bus body shall be attached
to the chassis frame at each main floor sill, to prevent shifting or separation
of body from the chassis under severe operating conditions.
Insulating material shall be placed at all contact points
between the body and chassis frame on Type B, C and D buses, and shall be so
attached to the chassis frame or body that it will not move under severe
operating conditions.
(22)
Overall Length and Width. Overall length of bus shall
not exceed 45 feet excluding accessories. Overall width of bus shall not exceed
102 inches, as provided in M.G.L. c. 90, § 19.
(23)
Rub Rails.
There shall be one rub rail located on each side of bus approximately at seat
level which shall extend from rear side of entrance door completely around bus
body (except emergency door) to point of curvature near outside cowl on left
side.
(a) There shall be one rub rail located
approximately at floor line which shall cover the same longitudinal area as
upper rub rail, except at wheel-housing, and shall extend only to radii of
right and left rear corners.
(b)
Both rub rails shall be attached at each body post and all other upright
structural members.
(c) Both rub
rails shall be four inches or more in width in their finished form, be of
16-gauge steel or suitable material of equivalent strength, and be constructed
in corrugated or ribbed fashion.
(d) There shall be a rub rail or equivalent
bracing located horizontally at the bottom edge of the body side
skirts.
(e) Both rub rails shall be
applied outside the body or outside the body posts. Pressed-in or snap-on rub
rails do not satisfy 540 CMR 7.05(22). For Type A and B vehicles using chassis
manufacturer's body, or for Type C and D buses using rear luggage or rear
engine compartment, rub rails need not extend around rear corners.
(24)
Seat Belt for
Driver. A Type 2 lap belt/shoulder harness seat belt shall be
provided for the driver. The assembly shall be equipped with an emergency
locking retractor (ELR) for the continuous belt system. The lap portion of the
belt shall be guided or anchored where practical to prevent the driver from
sliding sideways under it. The lap/shoulder belt shall be designed to allow for
easy adjustment in order to fit properly and to effectively protect drivers
varying in size from the 5th percentile adult female
to the 95th percentile adult male.
(25)
Seats and Restraining
Barriers.
(a)
Passenger Seating. All seats shall have a minimum
cushion depth of 15 inches and must comply with all requirements of FMVSS No.
222. School bus design capacities shall be in accordance with
49
C.F.R. 571.3 and FMVSS No. 222. In
determining the seating capacity of a bus the average rump width shall be a
minimum of 13 inches.
(b) All
restraining barriers and passenger seats shall be constructed with materials
that comply with FMVSS No. 302 (Flammability of Interior Materials).
(c) Each seat leg shall be secured to the
floor by a minimum of two bolts, washers and nuts. Flange-head nuts may be used
in lieu of nuts and washers, or seats may be track-mounted in
conformance with FMVSS No. 222. If track seating is installed, the manufacturer
shall supply minimum and maximum seat spacing dimensions applicable to the bus
provided such installation complies with FMVSS No. 222. This information shall
be on a label permanently affixed to the bus.
(d) All seat frames shall be fastened to the
seat rail with either two bolts, washers and nuts or flange-head
nuts.
(e) All school buses
(including Type A) shall be equipped with restraining barriers which conform to
FMVSS No. 222.
(f) All materials or
hardware used to replace or repair seats or restraining barriers shall comply
with FMVSS standards as they apply to school buses.
(26)
Steps. The
first step at the service door shall be not less than 12 inches and not more
than 16 inches from the ground, based on standard chassis specifications.
(a) The service door entrance may be equipped
with a two-step or three-step stepwell. In either case, risers shall be
approximately equal. When a plywood floor is used on steel, differential may be
increased by the plywood thickness.
(b) When a three-step stepwell is specified,
the first step at the service door shall be approximately ten to 14 inches from
the ground when the bus is empty, based on standard chassis
specifications.
(c) Type D vehicles
shall have a three-step stepwell with the first step at service door 12 to 16
inches from the ground.
(d) Steps
shall be enclosed to prevent the accumulation of ice and snow.
(e) Steps shall not protrude beyond the side
body line.
(f) A grab handle not
less than 20 inches in length shall be provided in an unobstructed location
inside doorway.
(27)
Step Treads. All steps, including the floor line
platform area, shall be covered with
3/16 inch rubber
floor covering or other materials equal to top grade rubber in wear and
abrasion resistance.
(a) The metal back of the
tread, minimum 24-gauge cold roll steel, shall be permanently bonded to ribbed
rubber; of grooved design with grooves running at 90 E angle to the long
dimension of step tread.
(b) A
3/16 inch ribbed
step tread shall have a 11/2 inch white nosing as integral piece without
any joint.
(c) Rubber portions of
step treads shall have the following characteristics:
1. Special compounding for good abrasion
resistance and high coefficient of friction.
2. Flexibility so that it can be bent around
a 1/2 inch mandrel both at 130 E F and 20 E F without breaking, cracking
or crazing.
3. Show a durometer
hardness 85 to 95.
(28)
Stirrup Steps.
There shall be at least one folding stirrup step or recessed foothold and
suitably located handles on each side of the front of the body for easy
accessibility for cleaning the windshield and lamps except when windshield and
lamps are easily accessible from the ground. Steps are permitted in or on the
front bumper, in lieu of the stirrup steps, if the windshield
and lamps are easily cleaned from that position.
(29)
Stop Warning
Device. Stop warning devices must meet the applicable requirements
of the Society of Automotive Engineers Standards, J1133 - April 1984. Arms
shall be of an octagonal shape with a white border and with the word STOP in
white letters not less than six inches high and one inch wide on a red
background, to be visible on both sides with the arm extended. Two red lamps,
incandescent strobe lights or LED lights not less than four inches in diameter
or the word STOP in LED lighting shall be mounted on the arm, one above the
word stop and one below, to be visible on both sides of the arm when in the
extended position. The arm shall automatically be activated with the lights
flashing whenever the red school bus warning lights are illuminated.
(a) In accordance with M.G.L. c. 90, §
7B, stop warning devices are required on all school buses.
(b) The stop warning device shall be
installed on the left side forward of the bus center line. The top of the arm
shall be below the lowest point of the window line and shall be positioned to
assure it will not obscure the operator's reflected view of the area
immediately forward of the rear wheels.
(30)
Sun Shield. An
interior adjustable transparent sun shield not less than six inches x 30 inches
for Types B, C and D vehicles, manufacturer standard sunshades for Type A
vehicles, with a finished edge, shall be installed in a position convenient for
use by the driver.
(31)
Undercoating. The entire underside of the bus body,
including floor sections, cross member and below floor line side panels, shall
be coated with a rust-proofing compound for which the compound manufacturer has
issued to the bus body builder a notarized certification of compliance that the
compound meets or exceeds all performance and qualitative requirements of
Federal Specification TT-C 520b, paragraph 3.4 (General Services
Administration) using the following modified test procedures:
(a) Salt spray resistance-pass test modified
to 5% salt and 1,000 hours.
(b)
Abrasion resistance-pass.
(c) Fire
resistance-pass.
Test panels to be prepared in accordance with Federal
Specification TT-C 520b, paragraph 4.6.12 with modified procedure requiring
that tests be made on a 48-hour air cured film at thickness recommended by
compound manufacturer.
(d)
The undercoating compound shall be applied with suitable airless or
conventional spray equipment to the recommended film thickness and shall show
no evidence of voids in cured film.
(32)
Ventilation.
Auxiliary fans, if used, shall meet the following requirements:
(a) Fan for the left and right sides shall be
in a location where it can be adjusted to its maximum effectiveness.
(b) These fans shall be a nominal six-inch
diameter.
(c) Fan blades shall be
covered with a protective cage. Each of these fans shall be controlled by a
separate switch.
(d) Body shall be
equipped with a suitably controlled ventilating system of sufficient capacity
to maintain the proper quantity of air under operating conditions without
opening of windows except in extremely warm weather.
(e) Static-type non-closeable exhaust
ventilation shall be installed in the low-pressure area of roof.
(f) Roof hatches designed to provide
ventilation in all types of extreme weather conditions may be
provided.
(33)
Wheelhousing. Wheelhousing opening shall allow for
easy tire removal and service.
(a)
Wheelhousing shall be attached to floor sheets in such a manner to prevent any
dust, water or fumes from entering the body. Wheelhousing shall be constructed
of a minimum 16-gauge steel or material of equivalent strength.
(b) The inside height of the wheelhousing
above the floor line shall not exceed 12 inches.
(c) The wheelhousing shall provide clearance
for installation and use of tire chains on single and dual (if so equipped)
power-driving wheels.
(d) No part
of a raised wheelhousing shall extend into the emergency door
opening.
(34)
Windows. Each full side window shall provide an
unobstructed emergency opening at least nine inches high and 22 inches wide,
obtained by lowering the window. Push-out type, split-sash windows may be
used.
(35)
Windshield
Wipers and Washers. A windshield wiping system, two-speed or more,
shall be provided.
(a) The wipers shall have
one or more air or electric motors of sufficient power to operate wipers. If
one motor is used, the wipers shall work in tandem to give full sweep of the
windshield.
(b) The bus shall have
a windshield washer which will effectively clean the entire area covered by
both windshield wipers.
(36)
Wiring. All
wiring shall conform to applicable current standards of Society of Automotive
Engineers.
(37)
Paint
Design, White Roof. Roof color to stop 5.5" above rain visor or
gutter over passenger windows. Paint design to include a 10.5" radius at both
front and rear roof caps which are painted body color.
