The Traffic Lights (or whatever you want to call them) are on the same location the driver stops, making it impossible to determine if its green or not without third person.

My suggestion for future maps if you don't want to or can't reposition them is to place them across the intersection from the actual lane. So that the driver(s) can see them.

In-game Reference

Reference Image from SCS Soft (American Truck Sim)[web.archive.org]