New statistics have revealed that Britain's major road network increased in length by just 1.1% in the decade between 1997 and 2007.
And the figures from the Road Users' Alliance (RUA) also show that the number of licensed vehicles rose by 26% over the same period.
Back in 1997, the length of major roads in the UK totalled 30,902 miles. By 2007, this had only gone up to 31,256 miles, the RUA said.
The alliance also said that the £46 billion paid by motorists in road-user taxes resulted in "a paltry" £4 billion investment in road capacity.
Tim Green, director of the RUA, said: "Road users have provided a rich seam of cash for the Treasury for decades and are receiving less and less for it.
"Apart from the damage this causes our economy, it is also a shot in the foot when you consider that motoring is the only form of transport that actually covers its carbon cost several times over.
"In return, road users are forced to cope with congested roads that add to emission levels."
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