I'd estimate that about 15-20% of the cars that I see going by when I'm trying to turn out of Amberfield Way onto Southall are exceeding the new 35 mph speed limit (including the 1-2% who seem to think that 50+ mph is just fine). I suspect that it would be higher, but many times I'm watching a group of cars going past, being led by a car that's obeying the speed limit. Since this is a no-passing zone, that one car is keeping all of the others in check.