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Bus is one of the major modes of mass public transport in India. Rollover accidents are a major concern for passenger safety in buses. Considering social and economical impact, AIS-031 regulation is being implemented in India from October 2008, which is equivalent to ECE-R66, specifying requirement of strength of superstructure of buses during rollover. The AIS 031 standard specifies four different methods viz. roll over test on a complete vehicle, roll over test on a body section, pendulum test on a body section and verification of strength of superstructure by calculation. Each method has its own advantages and disadvantages. Application of the standard also needs engineering evaluation of various aspects such as determination of a vehicle family and worst case among that family, which side to rollover, etc. The first revision of ECE-R66 has become effective from February 2006.