AN UNKNOWN quantity for any car journey is how long you might be delayed.

Figures released by the Department for Transport reveal how many seconds drivers will spend at a standstill for every mile they travel on an A road.

The data for the Isle of Wight shows that for every mile on one of the main roads on the Island a car will be delayed by 39 seconds.

So for a daily commute of five miles, a driver should add around three minutes to the journey to get to work on time. Anyone travelling 20 miles can expect a delay of around 13 minutes.

The latest statistics, covering 2017, show there has been a rise of ten per cent on the previous year.

And while the Isle of Wight's drivers may get furious about traffic jams, they are actually delayed less than majority of England.

England overall has an average delay time of 47 seconds per mile.

In 2017, Isle of Wight motorists drove along at 25mph on average.

This was slower than the previous year by two per cent.

The DfT recently announced it was investing up to £10 million in Street Manager, a programme which will pass on up-to-date information about roadworks to sat-navs and navigation apps.

It will allow local authorities and utility companies to quickly notify users on road closures or delays, by updating Google Maps or Citymapper in real time.