London's road user charging chief adjudicator says the capital's Low Emission Zone (LEZ) has only produced "a handful of appeals" following its launch last year.
As a result, plans to provide further training for adjudicators sitting on appeal tribunals have been dropped, and the number of available sittings has been reduced.
Transport for London's (TfL) controversial clean air scheme was opposed by the Freight Transport Association (FTA) for being "an expensive folly" with few environmental benefits.
However, FTA regional head of policy Gordon Telling says it hasn't received any enquiries from members who have received PCNs for flouting the LEZ emission rules.
"TfL, to its credit, was reasonably cooperative over teething problems and operated a fairly light touch at the beginning of the scheme," he says.
London Mayor Boris Johnson said earlier this year he would postpone phase three of the LEZ roll-out, which would bring light CVs and vans within the scope of the scheme, until 2012 in light of the economic downturn. TfL is now consulting the public on this plan.
Telling says that in commercial terms, the delay saves TfL "tens of millions of pounds", adding: "You'd be asking how many Transits there are out there between nine and 11 years old. It spent £45m on signage and communications for phases one and two. To contact a couple of thousand companies that are not members of trade bodies to do phase three costs a lot of money. I am pleased TfL is being prudent with its money."