Cars could become “death traps on wheels” if the annual MOT test is changed to every two years, the AA has warned.
At the moment, drivers are required to put their vehicle through an MOT test every year.
But under new plans, this could increase to every two years - and from three years to four years for a new car needing its first ever MOT.
The test itself could also change too, with a greater focus on emissions and electric and hybrid car batteries.
A consultation into the proposal - which would cover cars, vans and motorbikes - launched yesterday.
However, motoring organisations have this week sounded the alarm over fears it could cause a huge increase in unsafe cars on the roads.
An MOT tests how safe a car is with parts checked including lights, seatbelts, tyres and brakes.
Drivers who do not have a valid certificate can be fined up to £1,000.
Edmund King, president of the AA, told This is Money: “If you move the MOT from every year to two years that means you would have an increase of death traps on wheels on the road because there would be no independent check on those cars.
“And within two years, a driver doing 30,000 miles a year, it is very easy to have bald tyres and no brakes, and that's why the MOT is good.”
RAC's head of roads policy Nicholas Lyes added: “While we're not opposed to delaying a new vehicle's first MOT, we believe there should be a requirement for particularly high mileage vehicles to be tested sooner.
”'If the Government is looking to improve the MOT, now is the ideal time to take into account how much a vehicle is driven alongside the number of years it's been on the road.
“We're also disappointed the Government is still entertaining the idea of increasing the time between MOTs. Our research clearly shows drivers don't agree with this and believe it's dangerous.”
Eric Smith, MOT scheme manager at Kwik Fit said: "We don’t believe there is good evidence to indicate that delaying a car’s first test beyond three years is a risk worth taking.
"In fact, the Government’s own forecasts show that delaying tests could lead to an increase in road casualties as well as a risk of more cars running with illegal emission levels.
"Of the vehicle defects listed as contributory factors to accidents, the Government data show that tyres are most common, and tyre condition is unrelated to vehicle age.
"Our experience shows that the annual check remains vital in not only improving the safety of our customers but also extending the life of their vehicles and reducing drivers’ overall maintenance costs.”
The Department for Transport (DfT) argues that an annual MOT test is no longer needed due to advances in vehicle technology - and claims the change would collectively save drivers around £100million.
But motoring groups have challenged this saving, and argued that delaying repairs could work out more costly in the long-run.
The Mirror has contacted the Department for Transport for comment.