You must stop before crossing a railroad grade when carrying _______ of chlorine on your vehicle.

You must stop at each railroad crossing if you are carrying any chlorine gas and continue carefully afterwards. A chlorine spill brought on by a railway collision might be really damaging. Gaseous chlorine is quite hazardous. (If you're moving chlorine in cargo tanks, you must have a gas mask in the cab.) Additionally, chlorine is a strong oxidizer. When it comes into contact with flammable materials, it may explode. Gases that are caustic or dangerous could spread through the ensuing fires.