In 2012, the agency said it would phase out the flashing signs ... drivers speed up to make the light rather than slow down when the signals activate. That year, ODOT placed the radar traffic ...

According to a federal judge in St. Louis, flashing your headlights to warn of upcoming speed traps is a legally protected form of free speech and is therefore protected by the First Amendment ...

Cars driving through Montgomery Street trigger a radar speed ... approach the sign anywhere from 31 to 35 miles an hour, “but when the sign started flashing, I would see the speed drop down ...