It appears people use Radar Detectors to know when to slow down to avoid getting a speeding ticket. What if we flip that around? One way to get people to slow down would be to have police install install little "radar triggers" intermittently along the highways. The triggers would emit a radar type signal that would send a "false positive" to the radar detectors, alerting drivers to slow down. Drop a bunch of them along the interstate, and program them to come on at random times. Done correctly, folks would never know for sure if it is a legit signal or not.I go the idea about 15 years ago at a computer festival--some geek was selling them for $10. It actually worked, but it was manually operated.
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State troopers will often turn on their radar sets at accident scenes to slow approaching traffic. Besides, how do we know they aren't doing this already?
I few years ago, a company did something similar. You could by a box to put on your dash. When that Ferrari came speeding by with a radar detector on the dash, you hit a button on the box, which would transmit a radar signal. The Ferrari would step on the brakes and you would laugh. And it was marketed just like this.
Problem is...these devices were transmitting on the radar bands without a license to do so, which was a big FCC violation. The company stopped making them. Any device like this would have to be licensed by the FCC, and I can tell you they would not license a device like this.