People driving cars with excessively tinted windows are the focus of a new campaign by Leicestershire police.
The crackdown over the winter months will also target those who supply and fit such windows.
Police said front windscreens should allow 75% of light through, and front door windows 70%, otherwise road users could be put in danger.
But Sgt David Morris of Leicestershire Police said more and more cars were failing to meet those standards.
Car checks
He said: "An increasing number of vehicles have been checked around the county with levels as low as 5%, which is very dangerous.
"Any windows that allow less than 45% of light through leave the driver open to prosecution.
"If the amount of light is below 25% then the driver is likely to receive three penalty points and a fine of £60."
He said officers would be checking cars with tinted windows for light levels over the winter months.
The scheme is a joint initiative between Leicestershire Constabulary's Road Policing Unit and the county's Trading Standards department.
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