Here that doesn't seem to be the case. If you look at the western approach to the bridge in StreetView (which is from 2019, the eastern part has imagery after the collapse), there is no weight limitation sign to be seen. As such, you would expect the bridge to be able to carry the load in the worst case scenario of both lanes being filled to capacity with heavy vehicles, so failing because of one single truck and one or two cars is really bad...