If you think that road traffic is pretty bad as it is, things are only getting worse.

At least that is what the RAC Foundation points out with a new survey. According to them there will be at least four million more cars on the UK's roads in the next 25 years as the population will increase by more than 10 million.

Current data tells us that if all the cars were out at the same time, there would be around 245 vehicles per mile of road in Great Britain. A scary thought that becomes a nightmare when you add what the RAC research has found: traffic volumes are set to go up by 43% by 2035.

That means that average delays over the next 25 years will rise by 54%.

The fact that we will have more cars on the roads wouldn't surprise anyone. The problem comes when the government doesn't catch up with the situation and the investment in roads infrastructure is not enough.

The RAC Foundation said: "the government has significantly reduced road transport investment because of the recession and ministers have not explained what plans they have to cope with the bleak picture painted by their own numbers."

The foundation, working together with consultancy group Arup, has identified 96 unfunded road schemes that are "currently sitting on the Department for Transport's shelves."

"Forget about Plan B, ministers do not even have a Plan A for dealing with the awful conditions forecast for the roads in the years ahead. It is a case of jams today, and even more jams tomorrow," said RAC Foundation director Professor Stephen Glaister.

The Coalition government has an answer for the RAC claims. "Transport investment was treated as a priority for Government in the spending review and we have committed £4 billion on Highways Agency major projects, capital maintenance and enhancements. This substantial investment, alongside funding for the local road network, will drive economic growth and boost the UK economy," said Roads Minister Mike Penning.

According to the RAC, these ten unfunded projects in the country could return more than £6 for every pound invested on them:

• A453 widening (M1 to A52) Nottingham - £153m
• A5-M1 Dunstable northern bypass, Bedfordshire - £146m
• A21 Tonbridge to Pembury dual carriageway, Kent - £117m
• Kingkerswell bypass, Devon - £110m
• Leeds Inner Ring Road - £43m
• A38(M) Tame viaduct, West Midlands - £31m
• A47 Blofield to North Burlingham, Norfolk - £26m
• Evesham bridge maintenance, Worcestershire - £14m
• A45 westbound bridge, Solihull, West Midlands - £13m
• A18-A180 link, Lincolnshire - £8m