An Illinois State Police trooper uses a laser radar speed gun to clock motorists from the Black Lane overpass above Interstate 55/70.
An Illinois State Police trooper uses a laser radar speed gun to clock motorists from the Black Lane overpass above Interstate 55/70. Tim Vizer/BND
An Illinois State Police trooper uses a laser radar speed gun to clock motorists from the Black Lane overpass above Interstate 55/70. Tim Vizer/BND