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Old 02-02-2014, 03:38 AM   #3
Studly Adventurer
Joined: Sep 2011
Location: live free or die
Oddometer: 840
The triangle gives our range-finding binococular vision something to work with.

With cars, there are generally distinct, widely-spaced details to judge with, for example the headlights, whether they are lit or not.

It let your brain compute the changing angles of those points, more precisely, the rate of change, which gives you a perception of the speed.
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