Police use ultrasonic device to make sure drivers stay 3 feet from cyclists
Chattanooga Police now armed with custom-built device to teach drivers the law.
“For the last month now, Chattanooga Police Officer Rob Simmons has been biking around town with a new, unique ultrasonic sensor to make sure that drivers are obeying the state’s three-foot buffer law.
The law, which took effect in 2007, requires that when motorists pass a bike, they’re supposed to allow that much distance. But enforcing this law using only human eyes is pretty much pointless—it would be like trying to enforce speed laws without a radar gun. Tennessee is one of 24 states nationwide to enact such a law, but no other states have enforced the law using a device like this.