01.
Allowable Gross Vehicle
Weight. The gross vehicle weight allowable by overweight permit is
subject to the seasonal stability of the roadway and the capacity of the
structures on the route of travel. For the purpose of issuing special permits,
seven (7) levels of overweight are established, based on the weight formula of
W = 500((LN/N-1) + 12N + 36) and routes for carrying the various levels of
overweight are designated by color coding. The Weight Formula ("W") is the
maximum weight in pounds (to the nearest five hundred (500) pounds) carried on
any group of two (2) or more consecutive axles. "L" is the distance in feet
between the extremes of any group of two (2) or more consecutive axles, "N" is
the number of axles under consideration. The load factor based on the most
critical bridge on the highway route will also be used in determining allowable
weights. (3-31-22)
a. Red Routes - The red
routes contain posted bridges and require approval or analysis from the
Department. A vehicle configuration may be issued an annual overweight/oversize
permit for travel on red routes only, upon completion of an analysis verifying
the requested weights are acceptable. The annual permit will be issued for a
specific vehicle configuration, operating on a specific route, at specific
weights. All information will be listed on the annual permit and will be
subject to revocation at such time the vehicle configuration changes (such as
axle spacings), the approved weights change, or a bridge rating changes. Annual
permits issued for red routes will be in addition to the annual permit required
for other routes. (3-31-22)
b.
Yellow Routes - The yellow overweight level is based on a single axle loading
of twenty-two thousand five hundred (22,500) pounds, a tandem axle loading of
thirty-eight thousand (38,000) pounds, and a tridem axle loading of forty-eight
thousand (48,000) pounds or the equivalent loading as determined by spacings
and number of axles and computed by applying the formula W = 560 ((LN/N-1) +
12N + 36). (3-31-22)
c. Orange
Routes - Orange overweight level is based on a single axle loading of
twenty-four thousand (24,000) pounds, a tandem axle loading of forty-one
thousand (41,000) pounds, and a tridem axle loading of fifty-one thousand five
hundred (51,500) pounds or the equivalent loading as determined by spacings and
number of axles and computed by applying the formula W = 600 ((LN/N-1) + 12N +
36). (3-31-22)
d. Green Routes -
The green overweight level is based on a single axle loading of twenty-five
thousand five hundred (25,500) pounds, a tandem axle loading of forty-three
thousand five hundred (43,500) pounds, and a tridem axle loading of fifty-four
thousand five hundred (54,500) pounds or the equivalent loading as determined
by spacings and number of axles and computed by applying the formula W = 640
((LN/N-1) + 12N + 36). (3-31-22)
e.
Blue Routes - Blue overweight level is based on a single axle loading of
twenty-seven thousand (27,000) pounds, a tandem axle loading of forty-six
thousand (46,000) pounds, and a tridem axle loading of fifty-seven thousand
five hundred (57,500) pounds or the equivalent loading as determined by
spacings and number of axles and computed by applying the formula W = 675
((LN/N-1) + 12N + 36). (3-31-22)
f.
Purple Routes - The purple overweight level is based on a single axle loading
of thirty thousand (30,000) pounds, a tandem axle loading of fifty-one thousand
five hundred (51,500) pounds, and a tridem axle loading of sixty-four thousand
five hundred (64,500) pounds or the equivalent loading as determined by
spacings and number of axles and computed by applying the formula W = 755
((LN/N-1) + 12N + 36). (3-31-22)
g.
Black Routes - The black overweight level is based on a single axle loading of
thirty-three thousand (33,000), pounds a tandem axle loading of fifty-six
thousand (56,000) pounds, and a tridem axle loading of seventy thousand five
hundred (70,500) pounds or the equivalent loading as determined by spacings and
number of axles and computed by applying the formula W = 825 ((LN/N-1) + 12N +
36). (3-31-22)
02.
Vehicles or Loads Exceeding Annual Permitted Weights. Vehicles or
loads exceeding the axle weights, groups of axle weights, or total gross
weights allowed on any of the overweight levels described in Subsection
300.01 of this rule must operate
by single trip permits only if approved. (3-31-22)
