Decision-Making Guide for Traffic Signal Phasing (2020) / Chapter Skim
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Pages 40-46
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From page 40... ...
32 5 Right-Turn Phasing Mode The choice of right-turn phasing mode is often less deliberate than left-turn phasing mode. However, the appropriate right-turn treatment can help optimize right-turn delay and safety, particularly related to conflicts between right-turning vehicles and pedestrians.
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From page 41... ...
33 Table 4 illustrates how the two types of signal displays are typically used to communicate each of the three possible right-turn phasing modes. While the displays in the table are typical, other configurations are possible.
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From page 42... ...
34 Visibility Vi sib ili ty To allow permissive right turns, right-turning drivers must have a clear view of the adjacent parallel crosswalk and the pedestrian waiting areas on the near and far sides of the street. Blocked line of sight between drivers and pedestrians Protected-Only recommended Lane Configuration La ne C on fig ur at io n On an approach without an exclusive right-turn lane, permissive-only phasing mode is almost always used.
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35 La ne C on fig ur at io n On an approach with an exclusive right-turn lane and an adjacent shared through-right lane, the MUTCD does not limit right-turn phasing mode options. A protected right-turn phase that starts or ends at a different time than the through movement is not ideal, because drivers in the shared lane will have different green times based on their intended movement, potentially contributing to uncertainty that could lead to rear-end crashes.
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36 Ri gh t-T ur n Ov er la p (C on tin ue d) A right-turn overlap can cause a conflict between right-turning vehicles and cross-street traffic making a U-turn.
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37 Consideration for Pedestrian Movements Ri gh t-T ur n Co nf lic ts w ith P ed es tr ia n M ov em en ts On an approach with a parallel pedestrian phase,1 the MUTCD prohibits a right-turn green arrow when it conflicts with symbolic or text WALK or flashing DONT WALK indications (FHWA 2009b)
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From page 46... ...
38 Considerations for Bicyclists Bi cy cli st s On an approach with an exclusive right-turn lane and a separated bike lane where through bicyclists (in either or both directions) are directed to ride to the right of a right-turn lane, a conflict is created between through bicyclists and right-turning vehicles.
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