A PARALYSED leg is no handicap when driving a car, according to Fan To-sang, who will drive his taxi to Guangzhou on January 1 in a disabled drivers rally. Fifty motorists will take part in the Great Hong Kong-Guangzhou Disabled Drivers' Charity Campaign, which hopes to raise $5 million for the physically disabled of Hong Kong and Guangdong. Mr Fan, who has been a taxi driver for three years, said: ''I think the campaign could help disabled people to increase their career opportunities. If they can drive and own cars, then they can find a job.'' The Federation of Handicapped Youths' Disabled Drivers' Club plans to use the funds raised to lobby for a reduction in the cost of taxi permits for disabled people. The fee is about $2 million. There are about 20 disabled taxi drivers in Hong Kong, but Karan Mak Kam-king, chairman of the Disabled Drivers' Club and rally participant, wants to see this number increase. The Transport Department tests handicapped drivers to ensure they are safe after modifications are made to their cars. A practice for the rally will be held on November 14 at Sha Tin racecourse.