Link Light Rail

[garyhstorms10]

Why are the Traffic Lights Attached to the Arm above the crossing and my cities of Mineapolis MN Light Rail crossing there is two sets of traffic lights on eather side of the crossing at every intersection

[ortingdude]

There is a crossing on the BNSF in Puyallup at 15th St SE and another one at 12th St NW that are like this as well.

[asamojomaster]

this is one light rail crossing cantilever that i have never seen with normal traffic lights attached