Abstract
Steerability and stability are two of the most important properties of motor vehicles as concerns the possibility of preventing accidents. This paper describes tests on stability of the four wheel drive motor vehicles of categories M1 and N1. The aim of the tests was to determine the lateral stability on the tilt test rig and to determine the driving stability when executing the following manoeuvres: (1) turning at Rt = 35 m and lane-changing at S1c = 12-24 m. The aim of this work was to test and standardize the test methods and to work out a standardization document, regulating test methods, requirements for their results, and allowing to determine if the motor vehicles of those categories may be permitted to be used on public roads.