Teenagers will be told to 'stand up for their elders' on public transport – or risk losing their right to free travel.

英国伦敦近日出台新规，要求青少年乘坐公共交通时主动给老人让座，否则会失去免费乘坐公交车的待遇。

London Mayor Boris Johnson will unveil plans today to make youngsters sign a 'courtesy pledge' to promise to behave in a respectful manner when travelling in the capital.

The three-point pledge states that they will give up their seats to the elderly, pregnant and disabled; refrain from（克制） using offensive or threatening language; and be courteous¹（有礼貌的） and polite to fellow passengers and staff.

Those who refuse, or are caught behaving in a loutish²（粗野的） manner, will have their free travel passes removed.

The plan – a key part of Mr Johnson's re-election bid – will initially³ affect the 400,000 11-to-15-year-olds in London who qualify for free travel cards, but Tory sources believe the idea could be used across the country.

A Conservative insider said: 'The initiative chimes perfectly⁴ with the push to create a Big Society. It is about changing culture and expectations around behaviour to improve the atmosphere on buses and trains for everyone.'

Speaking before today's launch, Mr Johnson said he was determined⁵ to tackle the anti-social behaviour of a 'minority of youngsters' on public transport.

'When I was a boy, I was taught to stand up for those less able to,' he said. 'Youngsters enjoy the privilege of free travel, which is paid for by Londoners, but they have to understand that with that privilege comes responsibility.

Anyone who abuses this privilege will have it taken away, and will have to earn that right back.'

Teenagers found guilty of a serious breach⁶ of the new behaviour code will lose their travel passes, and will have to carry out unpaid⁷ community work to have them restored.

Mr Johnson is also introducing a 'two strikes and you're out' policy to deal with repeat offenders⁸, under which those committing a second serious breach of the code will lose their travel rights permanently⁹.

The move follows an earlier initiative of Mr Johnson's that banned the consumption of alcohol on public transport in the capital, which is credited with helping¹⁰ to drive down crime rates on buses and trains.