A car illegally parked on double yellow lines meant that fire crews "struggled to access" a building they were called out to in Stevenage.
Fire crews were called to Harrow Court at 6.53pm on Tuesday (March 1) after the high-rise building's fire alarms had been activated.
One of the crew said the illegally parked car hindered their access to the high rise building.
Because it was a high-rise building, both Stevenage fire engines attended, along with one from Hitchin fire station.
The Stevenage crew also took their ALP (aerial ladder platform) with them.
"Luckily the incident was a false alarm, with no fire situation," said a Herts Fire spokesperson.
"Had this been a high-rise fire, the illegal parking could have had a really negative impact on our response."
Herts Fire Control tweeted: "Double yellow lines are there for a reason.
"Last night, our crews struggled to access a premises due to inconsiderate parking.
"Please, whenever parking your vehicle, make sure there is enough space for emergency vehicles to pass."
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