Yeah, I did it for cash, no VAT!!Agree that busy traffic lights with pedestrians etc, you slow down more. But a bog standard crossroads, if I go through at 20, I'm going to struggle to stop in the event I see a RLJ out of the corner of my eye. I suspect for that to actually work you have to be slower still. I wonder, at a practical level, what proportion of drivers slow to that extent? I bet it's tiny...I certainly don't
Your calcs are close, it's 2 2/3 seconds. I; assume your error is down to being a Londoner where everything seems faster than here in the provinces
20mph is much better than 30. Quicker to stop and less likely to kill if collision occurs. I am not talking about crawling to 10. My initial point on p1 was that the OP said they ONLY slowed due to oncoming cars (ie would have been travelling at 30mph without) and I called them out on it. As it turns out they answered that they would slow which is all good.