I used to ride my bicycle on 635. Of course there was no traffic as it was just being built. I lived in Garland, about a mile from the highway. Northwest Hwy is now in what was once my back yard. When I learned to drive, I was taught that Dallas traffic was unforgiving. One didn't DARE enter the freeway (usually 75 N for me, aka North Central Expressway) unless they were doing the freeway speeds. If they were going too slow, they'd be run over and it would be their fault. NOWADAYS, drivers attempt to get on the freeway at 40 mph or so and don't even think once about yielding. I think that people have forgotten what yield signs and stop signs actually mean.