Fifty motorists who repeatedly flouted the law by driving on the hard shoulder of the M6 have been sent warning letters.
Police have been monitoring use of the hard shoulder during busy times as part of a tough new crackdown.
It comes after it emerged up to 250 drivers a day were using the hard shoulder illegally across the West Midlands.
Now letters have been sent out to repeat offenders to warn them of the consequences of driving on the hard shoulder.
They could eventually face prosecution, although police bosses say the aim is not to fine people.
Motorists were today reminded they should only drive in the hard shoulder when there is a speed limit shown over it on the overhead gantries.
The crackdown is being led by the Highways Agency and Central Motorway Police Group.
In a joint statement, officers said: “Police officers have been monitoring the use of the hard shoulder where it is opening to traffic during busy periods.
“This work started in September and will continue through to March next year.
“What they’ve found is that some people are continuing to misuse the hard shoulder, driving on it illegally.
“This month the police have issued around 50 letters to repeat offenders, warning them of the risk they are putting themselves and others at by doing this.
“The overall aim is for road users to correctly use the hard shoulder, not to fine them. All they need to do is to drive safely and get smart by only driving on the hard shoulder when there is a speed limit over it. If there is a red X or nothing displayed above it, don’t drive on it – it is for genuine emergencies only.”
The stretch of the M6 between junctions eight at West Bromwich and 10A for Essington is already part of the ‘managed motorways’ scheme, which sees the hard shoulder open up as a fourth lane at busy times in a bid to cut congestion.