Max speed - 90mph?

[KevinRS]

As someone who tends to end up running late for things, I have learned that hurried driving rarely moves the arrival estimate by a meaningful amount. There's very little room for improvement, especially compared to saving time at some part of your schedule before you're on the road.

Yeah, I'd better write that down...

Anyone can test that by using GPS and looking at when you get to the destination relative to the initial estimate. Have to repeat a few times, because traffic light timing can randomly throw it off by a couple of minutes. But drive the speed limit, you get there right about when the GPS said, go 10 over, you still get there about when the GPS said, unless it's a long straight interstate drive with no lights and little traffic, where you can make up a few minutes. If it's surface streets with traffic lights going faster just means waiting longer at red lights.