Waiting at a red light? It may not know you’re there
Summary
Many traffic lights in the U.S. may not detect that a car is waiting at a red light, causing longer stops or delays. There are about 320,000 traffic lights across the country, and some use technology that can miss seeing certain vehicles.Key Facts
- There are around 320,000 traffic lights in the United States.
- Some traffic lights use sensors to detect cars waiting at the light.
- These sensors sometimes fail to notice a vehicle, leading to unnecessary waiting.
- Different types of sensor technology are used, including magnetic detectors and cameras.
- Problems occur more often with motorcycles, bicycles, and electric cars because they have smaller metal signatures.
- Improving sensor technology could help make traffic flow better and reduce wait times.
- Traffic-light detection issues can cause frustration and longer travel time for drivers.
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