The controversial congestion charge has received the support of the city's major businesses a month to the day it was introduced.
Traffic levels have fallen since the charge began
Asked whether they thought the £5 charge was working, 74% of businesses questioned said yes, 3% said no and 23% were undecided.
The survey by London First, a business membership organisation which has long supported the charge, is a vote of confidence in the scheme which charges motorists £5 a day to drive into central London.
But with some small businesses on the charge zone boundary seeing takings fall by 15% or more since 17 February, not everyone believes the charge can yet be called a success.
Wine distribution company Cert Logistics is among those businesses benefiting from a 20% reduction in traffic.
It delivers wine to some of central London's top restaurants and hotels and says delivery times have been cut by as much as 50%.
Charge 'should be higher'
One of the company's managing directors, Michael Lainus, said he would like to see the charge tripled to £15.
He told BBC London: "I'm afraid we are seen as a little heretical in our trade but we actually believe the charge should be higher and maybe the area should be larger."
Only 5% of those surveyed felt it had harmed their business.
Most people, 65%, felt the scheme had no impact on their businesses while 30% said there were positive effects.
But the enthusiasm for the scheme was tempered by a mixed reaction to the technology it uses.
Two-thirds of those questioned said they had experienced problems registering their vehicles.