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"I believe an early version of HEC-RAS (I think it was version 3.0.1) did allow lateral weirs to be defined across roadway sections. However versions after that do not allow this to occur. I have had this situation before in which I had a really long lateral weir with a bridge in the middle. My solution was to break the lateral spillway into two separate spillways (one upstream and one downstream of the bridge). That seemed to work well for the scenario I was working with. I hope this helps."
Using separate weirs as Mr Penland indicated also worked for us in our models of canal networks in southern Florida.