I did wind up keyframing the traffic. It wound up looking good in that some traffic was stopping as if at traffic lights, while the other direction moved, and vice versa.
That said, I think it would be cool if at the instance of a ‘collision’, the two cars would have some friction so that one object would kind of bump into the other and when one moved out of the way, the other could proceed.
Thanks for the input!
~TPS