The Green Party has launched its transport plan for London, ahead of June's mayoral elections.

Proposals include the cancellation of all new road building, with the £1.2 billion saved reallocated towards improvements in public transport and facilities for cyclists and pedestrians, a 20 mph speed limit throughout the Capital by 2006 and a safe route to school scheme for every child by 2008.

In addition, the party pledges to increase accessibility for disabled travellers to 50 per cent of London's transport network by 2015, and full access by 2020.

All London Underground and rail services would be brought back into public ownership and an all-night tube service available at weekends.

Fares would be frozen for five years, with free travel available to young people and those out of work, while the congestion charge would be extended to the whole of Greater London.

A new orbital rail service would be constructed, with investment increased for new tramways.

"I want to provide Londoners with a truly reliable, affordable, safe and properly integrated transport system," said Green mayoral candidate Darren Johnson.

"I will introduce far-reaching measures in to improve local transport services, and to improve conditions for cyclists, pedestrians, disabled people, and those who have difficulties reaching essential services.

"Many poorer Londoners do not have cars, yet London is still geared to a car-driving populace causing pollution, poor air quality, respiratory illnesses and more London deaths each year than murder.

"In spite of the success of congestion charging, Mayor Livingstone is backing new road building and airport expansion which panders to big business rather than meets the needs of ordinary Londoners."