Never driven Route 9 myself but this kind of thing comes up a lot in abduction accounts. The "missing time" element is one of the most consistently reported details going back decades, its not just a modern thing.
What was the last thing you remember clearly before the gap? That detail matters a lot. Some researchers reckon theres a kind of "screen memory" that kicks in right at the point of contact, so the last thing you consciously recall can actually be significant.
Was anyone else in the car with you? Would love to know if a second person experienced the same gap or if they noticed anything off about your behaviour when you arrived home. Corroboration is everything with these cases.
If you're open to it, regression hypnotherapy has helped a lot of people piece together what happened during lost time episodes. Worth looking into if you want answers. Post as much detail as you can remember, even stuff that seems irrelevant - the community here is good at spotting patterns.