INDIANAPOLIS (AP) — Indianapolis is aiming to become the first major U.S. city to replace its entire fleet with environmentally friendly vehicles, in a move the mayor said is aimed at reducing the nation’s reliance on foreign oil.

Mayor Greg Ballard signed an executive order Wednesday requiring the city to replace its nearly 500 non-police sedans with electric or plug-in hybrid vehicles. The city also will work with the private sector to phase in snow plows, fire trucks and other heavy vehicles that run on compressed natural gas, and will ask automakers to develop a plug-in hybrid police car.