I am frequently puzzled by how one measures/talks about traffic flow. For example, the other day I was driving on a four-lane street (two in each direction) and I came up to a lane restriction near a traffic light. There were about 30 cars in the backup. I thought, it’ll only take two minutes to get through it. But it took ten. When I was halfway through the backup, I thought, that this backup would get much longer, stretching for miles behind me. But it didn’t. I looked behind me and there were about fifteen cars.
I am thinking there are different units needed to describe something moving (flowing traffic) and something stopped (30 cars in one place). So what are they?
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