The congestion charge is damaging business at restaurants in central London, according to a new survey.
Restaurants say the charge is not good for business
Almost four in five eateries, within or close to the congestion zone, said customer numbers had fallen since the £5-a-day charge was introduced in 2003.
The London Chamber of Commerce study revealed more than half said the road toll was "all" or "mostly" to blame.
Chamber chief executive Colin Stanbridge said: "Many believe the charge is making life difficult."
He added: "The decline comes at a time when the sector should have been emerging from the economic downturn in the early part of 2003.
"These findings will understandably alarm many business people who run restaurants in the proposed extension area in Kensington and Chelsea."