A safe but effective deterrent to a vehicle passing a stopped school bus would be a robotically launched bean bag, harmless but the impact would be a major wake up warning.-- molecat, Oct 17 2018 The bean bag cannons would be affixed to the bus like the guns on the tank near the end of Indiana Jones and the Last Crusade <paging 8th for specifics> and the beanbags would be on a string so that they can be sucked back into the cannonmouth for reuse.-- calum, Oct 17 2018 Let's distract poor drivers who are at that very moment driving past school buses.-- Voice, Oct 20 2018 Wouldn't it be better to stun the child with the bean bag if it looks like they're heading into traffic?-- not_morrison_rm, Oct 20 2018 random, halfbakery