Helemt Use: Required by law under age 18, required for instructional permit holders Eye Protection: Required by law under age 18 Daytime use of headlight: Required by law-modulating headlight permitted, required for vehicles manufactured after 1/1/56 Muffler: No acoustical criteria. Handelbar Height: Maximum of 15" above seat Lane Spliting: A motorcycle is entitled to the full use of a traffic lane and a vehicle may not be driven or operated in a manner that deprives another vehicle of the full use of a traffic lane. More Motorcycle Laws