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A record 83 percent of drivers complied with the rule, an ordinance passed in 2015. The data was collected using radar devices attached to bicycles, which volunteer cyclists tested over six months.
The ultrasonic device calculates the distance between a vehicle and bike during a passing situation, said Mark Schlutt, a Grand Rapids cyclist who rode for the National Highway Transportation Safety Administration research team.
Read more here:
“Florida handed out around 500 tickets last year to drivers who veered too close to cyclists when passing. But only eight drivers were actually found guilty.
Like 26 other states, Florida has a law requiring cars to give bikes at least a three-foot gap of space.
The problem is that it’s fairly impossible for a cop to judge exactly how far away a driver is and issue a ticket (or win a case if they do). So a new gadget uses sonar to measure.
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Read the full article here: http://ipmba.org/blog/comments/bike-sonar-is-helping-police-catch-drivers-who-squeeze-cyclists