Ministers are launching fresh efforts to deter car dealers from manipulating odometers by redesigning the MoT certificate.
The new MoT will display mileage readings from previous tests, in addition to those at the time of the current one.
According to ministers, the move will make it difficult for dealers to tamper with a car's mileage to boost its resale value.
Road safety minister Mike Penning told the Daily Telegraph: "These measures would give motorists the power to make the right decisions and avoid getting scammed into buying potential death traps.
"It will also deter those who attempt to defraud law abiding motorists and help to identify organised criminals who will often use clocking alongside more serious offences."
People clocking a car are not committing an offence until they try to sell the vehicle.
Nearly 700,000 clocked cars are estimated to be on roads in the UK.
According to the Office of Fair Trading (OFT), clocking could be costing motorists, who are already facing higher van insurance costs, nearly £600 million a year.
In 2010, the OFT called on the Government to take action against nearly 50 "mileage correction" businesses that might be adjusting the readings "for illegitimate reasons".
© Press Association 2011