This study presents the effects of a warning signal (countdown signal) on the totalrnstart-up lost time of automobiles at signalized intersections based on the data collected atrnthirty signalized intersections in Bangkok, Thailand. This signal is used to warn motorists inrnqueue at the stop line during any red phase on when each phase will start and end. The datarnindicates that the warning signal does not have any effect on the saturation headway ofrnautomobiles, but on the total start-up lost time. With the use of the warning signal, the totalrnstart-up lost time was decreased from 4.3 seconds to 2.9 seconds, or was reduced by thirtythreernpercent. Therefore, the warning signals may be used to increase the capacity ofrnsignalized intersections.
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