In case hazardous materials leaking from a container but not spilling from your vehicle. Drive to the closest place where you can get help:

Never move your vehicle, if doing so will cause contamination or damage the vehicle. Keep upwind and away from roadside rest stops, truck stops, cafes, and businesses. Never try to repack leaking containers. Unless you have the training and equipment to repair leaks safely, do not try it. Call your dispatcher or supervisor for instructions and, if needed, emergency personnel. [California Commercial Driver Handbook]