Abstract
Lateral instability of tractor semitrailer vehicle often occurs in during turning maneuver, accelerating, or braking,... Lateral instability can be classified into two types: yaw instability and rollover. The yaw instability usually occurs on low adhesion surface road. The rollover occurs while turning maneuver on high adhesion surface road. In this paper, a dynamic model of tractor semitrailer vehicle is established based on Multi-body System Method and Burchkhardt tire model. This model is applied to analysis the effect of road condition on lateral stability of the tractor semitrailer vehicle while turning maneuver.