Related Clues:

• Would it rise after the cart for firing?
• If a cart goes over this rise it may go off
• A cart might go over it and go off
• It's raised and fired after 30 across (5)
• One will rise to go off after the cart
• A cart might go off over such a hump
• It would be raised behind the cart and then would go off (5)
• If a cart were to go over anything so high it might go off
• If a cart gets over this it may go off
• The cart before the rise may make it go off
• The cart would shoot over the rough bit
• If a cart were to go over this it might go off
• If the cart were to go over it, it might go off
• Speed bump, essentially
• High as this is, a cart over it might go off