At first glance, it would seem obvious that children should be wearing seatbelts on school buses.
But it actually appears to be the source of some debate over safety and effectiveness.
Only a handful of US states require that children buckle up on school buses and there seems to be general agreement that the design of buses means they are much safer than they used to be.
Transport Minister Steven Joyce is right to tread carefully in reaction to calls for action after Monday's school bus crash in the Eastern Bay of Plenty.
These terrible events always, and understandably, spark an instant and often angry need for answers. But kneejerk responses from those in power are never the best option and beg the question: if this is right, why wasn't it already done?