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Red light, green light: How traffic signals work

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Red light, green light: How traffic signals work

T
The Washington Post

4 Views • Aug 05, 2014

Description

The first patented electric traffic signal went into operation 100 years ago. PostTV looks into how a modern traffic signal system keeps traffic flowing—or not—in a busy city like Washington, D.C.

Keywords & Tags

#traffic #dr gridlock #dr. gridlock #traffic signal #traffic jam #dc traffic #gridlock #traffic light #red light #green light #ddot #department of transportation #district department of transportation

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