"Rajesh Kakad \(BT\)" wrote in message news:c97fq7

So we should be able to turn LEFT at a RED light.

In general, I agree, but we do have a sort-of system where this is
allowed: green filter arrows.

This isn't the same can-turn-left-on-red-by-default but it's close
and it allows more flexibility: you can disable it if the traffic/
junction makes it unsafe to do so, and/or can change the timing
at certain times.

Do the USAns have filter arrows, or is it a Europe-specific thing ?

Aside: does anyone know why some traffic signals here show a
green filter arrow *AND* a solid green light simultaneoulsy,
given that the latter allows a superset of the filtered traffic
to "go". ?

Richard [in PO7]