This has a different theme each time and this year schools were asked to design an environmentally and user friendly transport system that is safe, non-polluting and fuel efficient and which will help to reduce traffic and improve the city's existing road system.

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The overall winner was Raynville Primary in Bramley which received £500 for a project for a new trolleybus system with a difference - the overhead electric cables would be powered by local wind farms.

Councillor Andrew Carter, Leeds city council leader and executive member with responsibility for city development, said: "Leeds is one of the best places in the country to live, but there are still improvements to be made in certain areas, one of which is the current transport system.

"I am delighted that these young people have come up with so many great ideas that could benefit the people of Leeds by making travel safer, greener and more user friendly."

Coun Rik Downes, chairman of Metro, added: "Children are the public transport users of tomorrow and it was great to be able to talk to them about today's network and give them theopportunity to come up with their own ideas and suggestions.

"There were some interesting proposals in this year's competition which I am sure can be looked at in more detail and considered for future proposals."

The Stan Kenyon Challenge is promoted by the council in conjunction with Sanderson Weatherall chartered surveyors.

It is named after a former director of planning to mark the contribution he made to the city during more than 30 years' service.

The Challenge seeks to raise pupils' awareness of the everyday environment around them and each year children are asked to investigate a topic relevant to their local area, exploring real issues they may be able to influence.