Originally Posted by beelnite
Couple of drawbacks: This light won't change unless a vehicle triggers the magnets. Bikes won't do it. So don't take the lane if there are no vehicles - you'll be sitting there a looooong time and if a vehicle does roll up behind you they might get rather irritated if they can't reach the magnets.
Pretty sure this one is just on a timer - no metal detection loops to be activated -- but it only comes up once every other signal cycle, to discourage traffic on Ladd, so it takes forever & a day sometimes to get a green.