In June, Transport for London (TfL) launched a consultation on plans to introduce lower speed limits on all TfL roads in the Congestion Charge Zone (CCZ) by May next year.

The move is a key part of Mayor Sadiq Khan's Vision Zero ambition to eliminate death and serious injury from London's transport network and would see 20mph limits introduced on 8.9km of main roads including Millbank, Albert Embankment, Victoria Embankment and Borough High Street. "Each year more than 4,000 people are killed or seriously injured on London's streets,” he said. “The evidence is clear - lowering speeds on the most dangerous roads saves lives."

A 20mph limit will also be introduced at Aldgate Gyratory, which is on the boundary of the CCZ, rather than within it. Combined with the 20mph limits already set on the vast majority of borough roads, this would mean that most of the roads in central London would become 20mph.

As well as new 20mph signs and road markings along routes, TfL plans to raise the height of pedestrian crossings in seven high-risk locations, including near the busy Embankment and Tower Hill Tube stations and in areas with a high number of pedestrians, such as outside the Tate Britain. The measures, designed to discourage speeding, have been chosen for locations where high numbers of collisions resulting in death or serious injury have previously occurred. Speed cameras on all of TfL's roads within the CCZ will be amended to 20mph, and mobile speed cameras will also be used to make sure drivers comply with the new limit.

Following the initial implementation, monitoring will be undertaken to determine whether further measures to reduce speeds further are required.

The press release from TfL provided comments from safety organisations supporting the reduction but did not offer any voice against it. There must come a point at which the viability of commerce within the city is affected by reducing the speed of transport.  No evidence was offered as to what that might be.

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