Where the cross street is one-way, can a vertical green arrow indication be substituted for circular green, to emphasize that wrong-way turns are not allowed into that one-way cross street?
It depends. Section 4D.05, paragraph 03, item F.1 only allows the display of a green arrow (including the vertical green arrow as well as turn arrows) to a movement that is not in conflict with other movements that are moving on a green or yellow indication. A left turn from the opposing approach that is allowed to move at the same time on a permissive basis on a circular green or flashing yellow arrow would be in conflict with the thru movement, as defined in Section 4D.05, so that thru movement could not be shown a vertical green arrow. A vertical green arrow could be displayed if the opposing approach has no simultaneous left turn because the left turn is: 1) geometrically not possible, 2) prohibited, or 3) controlled by a “protected only” mode of operation. Return to Top • Q: I’ve invented a new type of signal device that gives an “early warning” of the impending signal change from green to yellow by flashing the green for a few seconds before yellow or by “counting down” the numbe
