The Campaign for Better Transport (CBT) has warned that the UK Government's proposed planning reforms could lead to increased congestion on the country's roads.
A study commissioned by the group looked at what impact the building of new, large-scale business parks next to the M1 - permitted by the new planning framework permits - could have on traffic levels.
The study found there could be a 16% rise in traffic levels, increasing journey delays from 3.6 minutes per 10 miles to 6.4 minutes, if a new business park is built near an M1 junction.
It could also take congestion costs to nearly £250 million.
Stephen Joseph, chief executive of the CBT, said: "Far from helping economic growth, our research shows that the draft planning framework could actually end up damaging the economy through increased congestion.
"No-one wants to be stuck in bank holiday-style traffic jams twice a day just to do a day's work."
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