Speed cameras made out of painted yellow shoe boxes slowed down motorists in a Gloucestershire village, locals have claimed.
Residents said the makeshift devices triggered a noticeable fall in the number of cars careering through their hometown of Shurdington.
Cars had previously been recorded travelling at up to 80mph (128kmph) on Shurdington Road despite the 30mph limit.
Local volunteers running one-hour speed monitoring sessions three times a week recorded more than 1,600 cases of excessive speeding in the village over the last year.
The “cameras” were set up on August 6 and looked like yellow painted shoe boxes with black circles, designed to have the appearance of a camera. They have since been removed.
Fake speed cameras are not illegal in the UK but are discouraged by police.
People erecting fake cameras could also find themselves facing a civil lawsuit for particularly severe cases for misusing council property.
A Shurdington Parish Council spokesperson said they do not endorse the action but are “thrilled” people are reacting to the problem of speeding.
‘Cameras are only any good if it has film in it’
Robert Vines, a county councillor, said speeding was an ongoing issue and suggested that speed cameras could be effective if they were enforced.
“There’s no easy answer to the problem. Some people might suggest speed humps or speed cameras.
“But cameras are only any good if it has film in it and it is enforced.”
A Gloucestershire Constabulary spokesperson said just driving a few miles per hour above the speed limit can mean the difference between life and death.
They said: “Speeding is one of the ‘fatal four’ causes of road deaths and injury in the county along with using a mobile phone while driving, not wearing a seatbelt and drink or drug driving.
“Driving within the set limit allows you to stop safely within the distance you can see to be clear providing time to react and avoid a collision with another road user.
“Speed limits are set for a reason and exceeding them is illegal.
“The minimum penalty for speeding is £100 fine and three points added to your licence. Receiving 12 or more points within three years may disqualify you from driving.”
The force added that members of the public should contact their local policing teams online if they are worried about speeding in their local area.