NEW data reveals worrying news for drivers as the cost of pothole damage is once more on the increase.

After falls over the last two years, the last twelve months have seen the nation's drivers face a total bill of £1.7bn in repairing damage to their cars caused by potholes.

The level of damage is monitored annually by Kwik Fit, the UK's leading automotive service and repair company, for its PIT Report (Pothole Impact Tracker).

Its latest research has found that the average repair bill faced by drivers is the highest since the company began tracking the cost in 2013.

Drivers having to repair damage from potholes over the last twelve months had to fork out an average of £144 - up from £120 in the previous year.

It found that as well as the average repair cost going up, there was an increase in the number of drivers facing the highest bills. During the last year, over one million drivers have stumped up more than £300.

Kwik Fit's data includes all cars suffering pothole damage, not just those which have to be recovered from the roadside, but also those which can be driven to a garage.

The most commonly damaged components over the last year were tyres (in 38 per cent of repairs), suspension (28 per cent) and wheels (22 per cennt).

With advanced driver assistance systems (ADAS) becoming commonplace on vehicles, potholes are having a knock on effect beyond the immediate components damaged by the impact. Almost half of cars needing repairs also needed wheel alignment and a third required the ADAS system to be recalibrated, adding further cost.

The vast majority of the nation's repair bill has come directly from drivers' pockets, with 70 per cent funding repairs themselves.

Kwik Fit's research found that just six per cent had claimed compensation from the local authority responsible for the road.

An increasing number of cars are fitted with large wheel sizes, with tyre damage more costly for drivers of those vehicles. More drivers are protecting themselves with specialist tyre insurance - Kwik Fit has seen the proportion of its Tyrecare policies taken out on larger, premium tyres almost double over the last two years.

Over half of drivers believe that the roads in their area are in a worse condition than they were 12 months ago, with only 16 per cent thinking they are better.

The majority of drivers are also pessimistic about their immediate prospects. 62 pe cent say they don't expect the roads in their local area to improve in the near future, despite the additional funding recently announced by the government.

Dan Joyce, operations director at Kwik Fit, said: "It's concerning to see that the downward trend of the last two years has gone into reverse in the latest figures. Anything which adds unnecessary costs to motorists is especially unwelcome in the current economic climate but even the financial burden is outweighed by the risk to safety.

"The main components which bear the bulk of the damage - tyres and wheels, suspension and steering - are interlinked. Even if a car is driveable after hitting a pothole, the impact may have compromised its handling, as can be seen by the fact that many drivers have had to have vital ADAS technology recalibrated. Not only do potholes present an immediate risk at the time of impact, they can have a longer term effect on its safety