Abstract
The first full-scale roll-over tests of coaches and buses, in Europe, have been started at the beginning of 70's in Hungary. Later in 1986, the European Committee of Economy has accepted and issued a new regulation related to the bus and coach superstructures' strength. The previous methods and all the four test methods, accepted in the ECE R66, are discussed technically and critically in this paper. The recently used combined Hungarian method based on quasi-static tests of bus-frames and simplified computer simulation of roll-over process is presented too. (A)