A truck hit an overpass Monday night on the Saw Mill River Parkway in Yonkers, right near Yonkers Avenue.   

Trucks aren't supposed to be on the parkways, partly because of the overpasses. 

In this case, the truck not only hit the overpass, but a car also rear-ended the truck in the northbound lanes. 

Police are still trying to figure out how it happened, but they say no one was hurt, and traffic is already moving again normally.