Lincolnshire Fire and Rescue (LFR) is asking drivers to “Think before you park” after a water pipe was made “unusuable” by poor parking.
A parked car was caught on camera blocking a fire engine’s way to a hydrant in Grantham, but the appeal has been made by the emergency service to car owners across Lincolnshire.
An LFR spokesman said: “Blocked access causes delays and could cost lives in an emergency.
“Think of the question ‘Can a fire engine get past? and if in doubt, find another spot.”