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Intelligent people leave a space of about two cars ahead of them on the freeway.
Stupid people think that space must be for them.
Intelligent people leave a whole fucking lot more than just two car lengths.
I think they're saying 2 car lengths when in heavy traffic going 20 mph. I hope...
Back when i drove. I was taught 3 car lengths, or 3 seconds. Whichever is greater.
Two car lengths isn't even remotely enough space if you're traveling at high speeds.
Yeah, I follow the 3 second rule and try to keep 3 seconds of travel distance between me and the car in front of me
This is it. Absolute minimum two seconds in perfect conditions, four if it's raining/dark/whatever.
It depends.
On a well developed well maintained "freeway" with multiple lanes, shoulders for break downs, gentle curves, et cetera it's common. 3 car lengths is more common here I think.
That said, on a "highway" (interstate?) without everything listed above I aim for 2 seconds, which is about 60 metres at highway speed.