Abstract
Because the amount of traffic increased in the Tamagawa cycletrack for the runner boom and the bicycle boom, and the bicycle accident happened frequently with the pedestrian and the runner, the barrier in the cycletrack was investigated. It ran 23 km/h±2km/h in average and 1200km in total in the Tamagawa cycletrack by bicycle, the acceleration was measured with three axis accelerometer installed in the right wrist, and it took a picture of the video image at the same time. The results of measuring the acceleration of the Tamagawa cycletrack when running were 20 m/s^2 on the average and maximum value 205m/s^2 by the crack part of the road. Steps that had been set up for the speed control of the bicycle were observed to cause the speed decrease on 3.5 km/h average with the road bicycle.
