Ensure your semi truck is Ready for the Road Ahead™ with improved safety light, with the Dorman 4.8" 12V LED Cab Roof Marker Light. Due to its ability to securely mount to the roof of a vehicle, this replacement light is the ideal option to meet local or federal regulation standards. Manufactured with quality materials and meticulous testing to adhere to strict industry standards. FleetPride is your First Click in Heavy Duty®.