 The campaign is known for its "theatrical demonstrations" and mock parking tickets, credited to Berry (although now adapted by numerous local groups), some 150,000 of which have been placed on 4×4 vehicles by campaigners.The group was successful in getting the Mayor of London, Ken Livingstone, to adopt one of its founding principles when he introduced a higher congestion charge for vehicles with high emissions.The Alliance campaigns further for greater taxes and stricter controls on advertisements for 4×4s.