No, they don't have seatbelts for the buses.
I definitely think it should be mandatory for school buses, also for all buses -- I don't know how many times I've tried to save someone from falling when the bus driver moves out before the person can get seated -- especially if their carrying packages.
Since I am a bus taker, I wish something could be done to make the passengers safer.
I always sit in a seat behind another seat so when the driver puts on the brakes I have something to grab on to.
Karen