What are three types of sensors used for traffic light
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What are three types of sensors used for traffic light

[From: ] [author: ] [Date: 11-11-11] [Hit: ]
......
Three easy ones I can think of are:

A timer - times intervals.
Under the road pressure/magnetic sensor - senses when a car is present in a controlled lane.
crosswalk switches - allow pedestrians to indicate a desire for a light change.

One might include:

Car motion sensors - to trigger taking a car's picture when it enetrs a intersection in the wrong sequence.
Live cameras - to send video traffic status data to a control center.
Strobe sensors - to sense the presence of an approaching emergency v ehicle.
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