Assume N is the total number of buses. Where N=1 your solution works. For N>1 the engineers can still be hit by a bus. This also ignores all other vehicles such

Assume N is the total number of buses. Where N=1 your solution works. For N>1 the engineers can still be hit by a bus. This also ignores all other vehicles such as garbage trucks, semis and stealth bombers, all of which can take out your bus.