this post was submitted on 28 Apr 2024
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What is this thing?

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Yeah I know these are used for counting vehicles but can they also be used for detecting vehicle speed?

Description: two pneumatic hoses, affixed to a road. They lead to a box that's locked to a telephone pole. Location is southern California. On a minor artery road.

Doubtful that it's to survey if a new stop sign is needed since the next street is minor, dead ends into this one and already has a stop sign. The next intersection with another minor artery already has a stop sign.

Extremely doubtful that a traffic light is being considered since there isn't anywhere near the amount of traffic to justify one.

This is located on a slope. Many cars speed down here. That's why I'm wondering about speed sensing by this device.

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[–] SatansMaggotyCumFart 17 points 6 months ago (1 children)

If you know the distance between the two tubes you could determine speed and not need to know anything about the tire.

[–] [email protected] 3 points 6 months ago (2 children)

Would they be able to account for the difference in length between each axle on different vehicles?

[–] SatansMaggotyCumFart 12 points 6 months ago (1 children)

First hit on each would be the same tire and that’s all the information needed.

[–] [email protected] 3 points 6 months ago

That makes sense

[–] AProfessional 6 points 6 months ago

You measure a single tire, the whole vehicle doesn’t matter.