A mobile patrol car has been keeping an eye on drivers who create congestion and endanger children's lives by parking illegally outside schools.
Harrow Council ran a trial last week to gauge the effectiveness of using a CCTV-equipped vehicle to monitor the roads that become problematic when families drop off pupils.
No fines were issued because it was a dummy run but the enforcement officers observed plenty of motorists whose behaviour would typically have merited a penalty notice.
Kim Chadwick, whose daughter used to attend Weald Middle School, Robin Hood Drive, Harrow Weald, one of the schools involved in the trial, said: "There was a lot of parking on verges, outside private driveways and on zig-zag lines.
"I used to park away from the school and walk up, and if I could do it, other parents could. They just weren't both-ered - the nearer they can get the school, the better.
"If you're parking illegally, then you should get a ticket - it's the law."
The 'smart car', with an extendable 15ft periscope, was called in after several schools found that a minority of parents continued with their dangerous driving even after letters were circulated asking them to stop.
Mothers and fathers at the participating schools had been warned that the trial would be going ahead but were not told when.
Cllr Susan Hall (Conservative), portfolio holder for environment services, said: "This car is clearly marked as a CCTV vehicle - it's not hiding behind the bushes.
"Most parents park responsibly but there are a minority who ignore simple rules about parking.
"Our commitment is to ensure that children stay safe in the borough around the school gates and that traffic keeps moving.
"If we can keep Harrow's roads clearer and reduce accidents, use of this new smart car will pay dividends."
Harrow Council will now compile a report on the trial to determine whether it should buy or lease a CCTV car outright.