They need to be contained so they do not follow you, or trained not to follow you. You don't need to kennel them or tie them up. Just stick them in the house until the bus leaves. Or teach them stay, so that they do not follow the car. You are right, it is a very scary and possibly dangerous situation. Not only may they get hurt, but they may cause an accident, where a person is injured. Your family may then be liable for any damages or injuries because you did not contain your dogs. I hope you find an answer to your problem.