The main design for a commercial tractor is safety and a rollover protection structure has gradually been equipped on tractor. The purpose of this study is to experiment the sideways overturning behaviour of a commercially available tractor in China with rollover protection structure. The object vehicle is a small-size tractor which weights near 1200 kg and was widely used in Chinese farm work. The cases of sideways overturning accident with no travelling speed and with idling speed with first gear were considered. Two gyroscopes were attached to the left and right fender on the rear wheels to measure the dynamic of this tractor. The rollover protection structure for the object tractor has been assembled to laterally contact the ground ahead of any side parts on this tractor, and a weight sensor was assembled at the lateral contact point of the rollover protection structure. The result shows that the sideways overturning behaviour of no traveling speed case was similar to that of idling speed case. Moreover, the result of measured impact force is significant while the rollover protection structure for a small-size commercially available tractor in China was designed.
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