Warranty Holdings' report on motoring has predicted cars will be banned from most city centres over the next ten years. The number of vehicles is predicted to grow 50 per cent during the next two decades. The report entitled 20/20 Vision was commissioned by Warranty Holdings to look back at the last 20 years of motoring and forward to the next 20. Key findings are the car population will grow to 32 million from today's 21 million, traffic will be curbed as congestion grows, and road pricing will become a standard feature of city driving. The report has a large section on technology and its effect on driving and buying cars. It suggests the car showroom of the future will not have cars in them at all but interactive multimedia technology display tools. Technology will also be turned to monitoring all vehicle and driving functions. The environment will dominate many issues and 20/20 says green levies may be introduced for dirty cars. Despite all this technology driving is slowing. It takes longer to cross London today than it did 200 years ago. This trend the report suggests will continue. Traffic jams set to worsen