I grew up in Detroit & spent a good deal of time (early 60's) on Woodward Avenue. It wasn't uncommon to see trailered rigs show up on the weekends from Ohio, NY, NJ. and IL. The factory engineers were there too... trying out their latest stuff on the street. It would be impossible to guess the number of cars running on Woodward on A typical weekend, but I know it would be in the thousands. I've seen pretty much everything you can imagine running on the streets back then.... Remember, it was a completely different time.. urban sprawl hadn't taken over the out lying areas & "civilian" traffic was just about non-existant after 11:00 P.M. Oh, and there was hundreds of drive-in restaurants that catered to the car crowd back then, not like today.