For rental agencies and companies, the cars owned would be a fleet. Several cars escorting a VIP would be a motorcade.
However, what if I want to say:
I dislike being the lone driver in an empty stretch of highway, so I may end up speeding to get from the [group of cars] behind me to the [group of cars] in front.
Is there a good collective noun that would apply to this situation? Or would it be a matter of choosing a general term, like group, cluster, block etc.