Motorists' organisations and green groups are seeking fare concessions on public transport next Monday, which is being promoted as 'Ride Green Day' to coincide with World Environment Day. Senior government officials have been urged not to use their private cars on the day. The Environmental Campaign Committee, which operates under the Environmental Protection Department, is organising the event. It will feature an exhibition and the committee will distribute stickers and leaflets aimed at encouraging drivers to use public transport. Full details of the event will be revealed on Thursday. The event, the first of its kind in Hong Kong, is aimed at raising public awareness. The Hong Kong Automobile Association said the Government and public transport operators should introduce fare concessions on June 5. 'Free travel may not be possible, but perhaps a 50 per cent fare discount may be affordable,' association president Jackson Ho Yee-tak said. Friends of the Earth assistant director Edwin Lau Che-feng supported the idea of fare concessions. He also called on top officials to set an example. 'It will be interesting to see if senior officials such as Anson Chan [Fang On-sang] and Donald Tsang [Yam-kuen] will set an example by getting to work next Monday morning by public transport,' he said. The offices of the Chief Secretary for Administration Mrs Chan, Financial Secretary Mr Tsang and Chief Executive Tung Chee-hwa said no decision had been made on how they would get to work. Kowloon Motor Bus, co-sponsors of the event, sidestepped the concession proposal. 'There are many ways to support a campaign other than offering free rides or discount fares,' the company's acting public relations manager, Chan Pik-yin, said. New World First Bus said reducing fares could cause problems. 'It is hard to estimate the number of extra passengers to be expected,' a company spokesman said. There are more than 320,000 private cars in Hong Kong, about 60 per cent of the total number of vehicles. Both France and Italy have held car-free Sundays in major cities, with free public transport provided. Nine other European countries have promised to undertake similar environmental trials this year.