Multiple traffic signals on road

[lordsutch]

I kind of like the use of left-mounted left turn signals, as they're good for permissive turn lanes so you can keep an eye on oncoming traffic and the signal head simultaneously; they're fairly ubiquitous in Memphis and its surrounding suburbs (example).

[SignBridge]

I agree. Those far-left supplemental signals are standard in California but used only intermittently in New York, I'm sorry to say. What's worse there doesn't seem to be any standard or consistency to where and when they are used here. Some intersections have them, some don't. For all I know it could depend on how much money is left over after they design the signals for the intersection. 

[cl94]

I agree. Those far-left supplemental signals are standard in California but used only intermittently in New York, I'm sorry to say. What's worse there doesn't seem to be any standard or consistency to where and when they are used here. Some intersections have them, some don't. For all I know it could depend on how much money is left over after they design the signals for the intersection.

Lately, NYSDOT (particularly Region 1) has been pole-mounting supplemental signals to the right on the major approaches. Several examples of that in the Albany area, particularly along US 9. Turn signals are almost always one per lane, with the exception of some double-right doghouses that only have one for both lanes. Given the lack of funding, we're not going to see left-side supplementals anytime soon unless the MUTCD requires them.

[roadfro]

Lately, NYSDOT (particularly Region 1) has been pole-mounting supplemental signals to the right on the major approaches. Several examples of that in the Albany area, particularly along US 9. Turn signals are almost always one per lane, with the exception of some double-right doghouses that only have one for both lanes. Given the lack of funding, we're not going to see left-side supplementals anytime soon unless the MUTCD requires them.

That's a shame, really.

MUTCD only requires minimum two signal heads for the major movement on the approach (and, as of 2009, the through movement regardless of it being the major movement or not). Good signal design would provide minimum 2 signal heads for every signalized movement, as to make sure there is a redundant signal head in case of a bulb burnout or other failure. Best practices (typically employed for new installations in California, Nevada and elsewhere) use one overhead signal head per lane plus supplemental pole mounts as a standard.

Those supplemental pole mount proves very valuable at times. Especially when high profile vehicles block views of signal heads.

[SignBridge]

I agree with Roadfro. Those western states that he named do a far better job of signal design and configuration than many eastern states like New York. I always liked California's installations best although sometimes they (and Colorado)  seem to over-signalize at some locations.