For maximum safety and visibility we highly recommend the use of an alternating light kit, as well as safety signs, and a swing arm. (all sold here) These lights are bright spot beams and come inside of a rubber housing with the flasher built in. Simply connect to vehicle power and add a switch. Lights will alternate. We suggest placing these lights on the upper front and rear of a truck, as highly and as widely spaced as practicable, similar to that of a school bus. Check with local laws before choosing color - available in red or amber. Each kit below comes with 2 lights. You will need 2 kits to do both the front and rear of your vehicle. CALL FOR REPLACEMENT BULBS.