Mar 13, 2017 · The bimodal 3-section head (bimodal green arrow/FYA) was introduced simultaneously with the 4-section head in the 2009 MUTCD. The alternate 3-section version, with the solid and flashing yellow in the same section, is a more recent interim approval approved in 2014 that is expected to be adopted in the next version of the MUTCD.

Mar 13, 2015 · Quote from: Pink Jazz on March 13, 2015, 11:37:17 PM Quote from: jakeroot on March 13, 2015, 11:17:46 PM Given my experience with Canada, I'd love to try an experiment with the bimodal arrows whereby the green arrow flashed, indicating a protected turn, then stopped flashing on an amber arrow, then disappeared (this should help distinguish between the two for color-blind individuals).

Aug 14, 2013 · Fiber Optic Bimodal Arrow by Signals Unlimited, on Flickr Quote from: 1995hoo on August 20, 2013, 09:45:51 AM Using Emmet Street at Ivy Road as an example: (1) Northbound Emmet gets a green ball to go straight and a green left arrow, southbound Emmet has a red. (2) The green arrow turns off and southbound Emmet gets a green ball but no turn ...

Mar 13, 2015 · Quote from: Ian on March 16, 2015, 01:53:02 PM Quote from: PHLBOS on March 16, 2015, 11:37:35 AM Southeastern PA used to have bimodal G/Y arrow signalheads on many a few of their signalized intersections but most if not all of them have since been replaced with the now-more common 5-head doghouse signalheads

Jun 11, 2021 · I don't see the point, personally. Most of the world gets by with just a steady-lit green arrow. Most of the world doesn't use bimodal signals. As I stated above, it is to differ between the green and yellow arrow phases. But for consistency, many provinces now use it to indicate all protected lefts.

Feb 27, 2015 · Last year, there was a study by TRB/NCHRP about bimodal green arrow/flashing yellow arrow heads, and apparently the recommendation was against them. Instead, TRB/NCHRP recommends placing the FYA in the same position as the steady yellow arrow, which the FHWA granted interim approval last year in three-section signals (not in doghouses).

Jun 17, 2010 · The 4 head has the advantage of alerting motorists that the light either is a FYA, or in states where the bottom section is the green (or bimodal) arrow, a protected/permissive traffic light. The 3 head assembly will leave motorists unfamiliar with the intersection guessing if it's a protected-only light or a FYA until they see what happens.

Apr 10, 2012 · On a side note, Overland Park and Lenexa are also using three-lens flashing yellow arrow signals for protected/permissive left turns, which of course requires a bimodal arrow, although examples of both the three-lens and four-lens configurations exist in Overland Park.

Aug 14, 2013 · ^^ I don't think that is MUTCD compliant, in the use of a doghouse nor a bimodal lens for a FYA. The functional operation of this doghouse FYA would seem to be appropriate, and the bimodal lens is fine (it is the functional equivalent of the 3-section FYA with bimodal arrow). However, the use of this signal for option lanes is the problem.

Aug 16, 2021 · This right turn signal (now an FYA, for the record) has a bimodal bottom lens for exactly this reason, despite it being a lagging green arrow. This deficiency also exists with flashing yellow arrow (FYA) signals: both the protected green arrow and permissive flashing yellow arrow are followed by solid yellow arrows, but the solid yellow arrows ...