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Citation |
Virkler M, Maddela RR. Transp. Res. Rec. 1995; 1484: 66-72. |
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Copyright |
(Copyright © 1995, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing) |
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DOI |
unavailable |
PMID |
unavailable |
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Abstract |
Right turn on red (RTOR) can have a significant effect on intersection operation, but RTOR volume data are seldom collected and are not available for solving intersection design problems. Two techniques have been suggested for analyzing RTOR in the absence of field data. The first is to assume that during a protected left-turn phase, the RTOR movement that is "shadowed" by the protected left turn can have a volume equal to the per-lane volume of the shadowing left turn. The second technique suggests that the movement of an RTOR vehicle is analogous to the movement of a right-turning vehicle at a stop sign-controlled, unsignalized intersection. Extra capacity is present for an RTOR vehicle to move through the unsaturated green portions of movements that currently have a green indication. These two approaches are examined with data from 40 intersections to determine ways to provide a more realistic estimate of intersection operations when significant RTOR volumes may occur. Both approaches yield significant changes in reported intersection operation. For instance, shadowing improved the reported level of service for almost a third of the exclusive right-turn lanes. The stop sign analogy drastically reduced the number of right-turn lanes reported as over capacity. Neither approach is modeled correctly by the Highway Capacity Manual delay equation used for estimating level of service, but modeling of RTOR with the stop sign analogy could lead to a more realistic description of intersection performance and a more efficient use of green time as well as eliminate the construction of unneeded lanes. Language: en |
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Keywords |
Intersections; Mathematical models; Traffic signals; Highway traffic control; Motor transportation; Highway administration |