We start all our dirt tri oval races with rolling starts, single file, and the guy running the computer hits the start button after we cross the transponder scoring loop. We pace so we don't get back to start before the start tone. Five seconds from pressing start button until final start tone. Tri oval is 200'. We do this for 1/10 Sliders, 1/8 electric late model, short course late model. We also start the mains the same way. Have not had any issues since we started this first of this season.