Current through Register Vol. 28, No. 3, September 1, 2024
Support:
01 A
lane that is shared by left-turn and right-turn movements is sometimes provided
on an approach that has no through movement, such as the stem of a
T-intersection or where the opposite approach is a one-way roadway in the
opposing direction.
Standard:
02 When a shared left-turn/right-turn lane
exists on a signalized approach, the left-turn and right-turn movements shall
start and terminate simultaneously and the red signal indication used in each
of the signal faces on the approach shall be a CIRCULAR RED.
Support:
03 This requirement for the use of CIRCULAR
RED signal indications in signal faces for approaches having a shared lane for
left-turn and right-turn movements is a specific exception to other provisions
in this Chapter that would otherwise require the use of RED ARROW signal
indications.
Standard:
04 The signal faces provided for an approach
with a shared left-turn/right-turn lane and no through movement shall be one of
the following:
A. Two or more signal faces,
each capable of displaying CIRCULAR RED, CIRCULAR YELLOW, and CIRCULAR GREEN
signal indications, shall be provided for the approach. This display shall be
permissible regardless of number of exclusive left-turn and/or right-turn lanes
that exist on the approach in addition to the shared left-turn/right-turn lane
and regardless of whether or not there are pedestrian or opposing vehicular
movements that conflict with the left-turn or right-turn movements. However, if
there is an opposing approach and the signal phasing protects the left-turn
movement on the approach with the shared left-turn/right-turn lane from
conflicts with the opposing vehicular movements and any signalized pedestrian
movements, a left-turn GREEN ARROW signal indication shall also be included in
the left-most signal face and shall be displayed simultaneously with the
CIRCULAR GREEN signal indication.
B. If the approach has one or more exclusive
turn lanes in addition to the shared left-turn/right-turn lane and there is no
conflict with a signalized vehicular or pedestrian movement, and GREEN ARROW
signal indications are used in place of CIRCULAR GREEN signal indications on
the approach, the signal faces for the approach shall be:
1. A signal face(s) capable of displaying
CIRCULAR RED, YELLOW ARROW, and GREEN ARROW signal indications for the
exclusive turn lane(s), with the arrows pointing in the direction of the turn,
and
2. A shared
left-turn/right-turn signal face capable of displaying CIRCULAR RED, left-turn
YELLOW ARROW, left-turn GREEN ARROW, right-turn YELLOW ARROW, and right-turn
GREEN ARROW signal indications, in an arrangement of signal sections that
complies with the provisions of Section 4D.09 or 4D.10.
C. If the approach has one or more exclusive
turn lanes in addition to the shared left-turn/right-turn lane and there is a
conflict with a signalized vehicular or pedestrian movement, and flashing
YELLOW ARROW signal indications are used in place of CIRCULAR GREEN signal
indications on the approach, the signal faces for the approach shall be as
described in Items B.1 and B.2, except that flashing YELLOW ARROW signal
indications shall be used in place of the GREEN ARROW signal indications for
the turning movement(s) that conflicts with the signalized vehicular or
pedestrian movement.
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Support:
05 Figure 4D-20 illustrates application of
these Standards on approaches that have only a shared left-turn/right-turn
lane, and on approaches that have one or more exclusive turn lanes in addition
to the shared left-turn/right-turn lane.
Option:
06 If the lane-use regulations on an approach
are variable such that at certain times all of the lanes on the approach are
designated as exclusive turn lanes and no lane is designated as a shared
left-turn/right-turn lane:
A. During the times
that no lane is designated as a shared left-turn/right-turn lane, the left-turn
and right-turn movements may start and terminate independently, and the
left-turn and right-turn movements may be operated in one or more of the modes
of operation as described in Sections 4D.17 through 4D.24; and
B. If a protected-permissive mode is used,
the shared left-turn/right-turn signal face provided in Paragraph 4 may be
modified to include a dual-arrow signal section capable of displaying both a
GREEN ARROW signal indication and a flashing YELLOW ARROW signal indication for
a turn movement(s) in order to not exceed the maximum of five sections per
signal face provided in Section 4D.08.
Support:
07 (DE Revision) DelDOT's "Traffic Design
Manual" contains further information regarding signal indications for
approaches with shared left-turn/right-turn lanes and no through
movement.
