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Student
 · PuneIndia
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We can use ultrasonic or Pir sensor but I think we need to use an array of these sensor for effective control

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Innovator
 · BengaluruIndia
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It will be better if you place an array of ultrasonic in the Y axis of the road so that one can know from a quite large distance that a car is about to come and another sensor in the X axis of the road so to confirm that the car has passed away to dim the light.

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