Original sentence: Motorcycle couriers are common in major urban centres, primarily in Europe, South America (especially Brazil) and Asia, but increasingly in North America.The advent of the facsimile machine in the 80's, and electronic mail in the 1990s saw a significant decrease in the volume of work for London's motorcycle couriers
Edited sentence: According to a report referenced by the London congestion charge, the introduction of this tariff has led to an "increased use of motorbikes".Increasing traffic congestion and rising fuel costs make motorcycle couriers an attractive option for the movement of small packages and high priority consignments.Many riders have left the courier industry altogether.Motorcycle couriers are common in major urban centres, primarily in Europe, South America (especially Brazil) and Asia but increasingly in North America.Motorcycle couriers have to compete with cycle couriers for the same work, and rates have stagnated.Small companies have been bought out by larger ones, and many have diversified into executive/private-hire/chauffeur/passenger operations.Some have since become paparazzi and value the mobility of a motorcycle; their street knowledge of London is also useful.The advent of the facsimile machine in the 80's, and electronic mail in the 90's saw a significant decrease in the volume of work for London's motorcycle couriers