One Roman taxi driver in five is willing to change to an electrical-powered car, and city mayor Walter Veltroni has announced that the first 100 should be in service in the city this year. A further 300 will be on the road by the end of 2006. Although these vehicles cost much more than a conventional car (59,000, whereas a normal taxi costs about 20,000), maintenance expenses are 25 per cent less and the ministry for the environment is offering grants to taxi drivers who make the switch.