This is the first new section to be opened since the pilot red route scheme began in north and east London in January 1991.
'I greatly welcome this new section of red route and I look forward to the continuing introduction of the red route network in the coming few years,' Mr Norris said.
'It is the most important, exciting and comprehensive traffic management project in London for many years and addresses many of the traffic problems which face us today.
'Red routes will bring welcome environmental benefits to the areas through which they pass. Associated traffic calming measures will force rat-running traffic onto the main roads.
'Thousands of new trees will be planted along the 315-mile red route network; I am particularly delighted to help plant the first of them today.'
Other new sections of the red route network which will come into operation over the next few weeks are:
the A205 (South Circular) from Chiswick Roundabout to the junction with Roehampton Lane (A306), the A306 and the A3 from its junction with the A306 to the Kingston/Surrey border.
The red route network aims to reduce the impact of congestion by optimising the use of road space on London's main roads, and in particular to: provide special help for the efficient movement of buses, improve the local environment and provide better conditions for pedestrians, cyclists and people with disabilities.