The London Lorry Control scheme is managed by London Councils.
Enforcement is carried out by a team of enforcement officers who monitor vehicles from the roadside. They use their cars to patrol London and target specific locations that are either complaint sensitive or where experience has shown they will observe high numbers of heavy goods vehicles. They are often observed at convergence locations.
Convergence locations are sites where a number of routes come together, often having passed through different boroughs. At these sites officers see a greater number of lorries, therefore enforcement is more effective.
In practical terms once a series of lorries are caught the drivers may decide to change their routes. The flexibility of mobile enforcement means they can be pursued to the new locations, particularly as their alternative routes tend to be limited by the size of their vehicles and their intended destinations.