ATV's have been out over the past few days, sometimes as a necessary means of transportation with the icy streets, and sometimes just for fun. Police say the all terrain vehicles have caused a few problems and spawned several calls from concerned and annoyed residents. ATVs are not street legal on state or federal highways because they don't have the same safety equipment as cars or trucks--that means blinkers, brake lights, and horns. Police say they know 4-wheelers are out on the roads and as long as they're not causing trouble they'll probably let it slide given the circumstances. But during normal times, officers can impound the ATVs and ticket the riders.