Motorists driving with tinted windows are being urged to pull in at a police station to have their vehicles checked.
Tinted windscreens have been blamed for road accidents
Dorset Police launched a new safety campaign earlier this month spelling out the dangers of driving with heavily-tinted windscreens.
They say there has been an increase in collisions involving cars with excessively tinted windows and motorcycle riders with tinted visors.
Checks are being held at Ferndown police station on Saturday and Sunday.
Special tint-measuring equipment will be used by the officers between 10am and 2pm.
Officers say having heavily-tinted windscreens is the same as "wearing sunglasses at night" and many are illegal.
Drivers can be stopped from using their vehicles until the tinting is removed.
Sergeant Steve Quill said: "These windows and visors do appear to contribute to many of the accidents.
"We've attended many road traffic collisions - both serious and near misses - where at least one of the vehicles involved has had tinted windows and also many motorcycle collisions where the riders have been wearing tinted or darkened visors."
Dorset Police says that, while some tinting is allowed, the law states there should be no restriction to the driver's ability to see the road.