It is necessary to be able to carry a load to any kind of place by transportation vehicle safely. For that purpose load-carrying platform horizontal level-keeping performance is significant on a transportation vehicle. However, a vehicle does not have a platform level-keeping function generally. Such a vehicle needs to have enough traveling performance also. In this research, it is aimed the stability of the load-carrying platform on level-keeping. A new system is developed for level control of roll direction. Such a system is added to pitching system. A leveling control for pitch and roll angles is carried out with the signal of the acceleration sensor. Then the performance of an experiment machine in cart driving is confirmed.
