The Automobile Association says the policing of seat belt rules on buses needs improvement.
Bus passengers are required by law to wear a seat belt if one is provided.
Figures show 124 infringement notices were issued in the past five years to people not wearing seatbelts on buses, including 12 in 2006.
In the same period, more than 70,000 seat belt offences were committed in other vehicles each year.
The Automobile Association says more enforcement and education is needed for buses.
It says anecdotal evidence suggests people do not put on seat belts on buses that provide them.