What is the normal color of the heads? It could be that the overhead was damaged by the tree, and they only had a green one on the truck. Or the primary (on the pole) was damaged say by a large van too close to the pole an scraping it off, and they only had a yellow head. BTW in Calif most signal heads are green, but some cities paint the backs a different color.
The Normal Color Varies...alot of the Old Signals in Dallas are Green which used to be a Pretty Popular Color...the New Signals in Dallas are Yellow,which seems to be the most Dominant color in the US...other wise most Manufactures offer Custom Colors.
Sometimes its normal for a Color Combo...for example a Yellow Signal Head with Black Visors.
Sometimes its normal for a Color Combo...for example a Yellow Signal Head with Black Visors.