TONAWANDA, N.Y. -- General Motors says it wants to see a "hydrogen highway" that would allow the fuel cell cars now under development to drive from one end of New York state to the other.

GM officials visited the Tonawanda engine plant near Buffalo with two hydrogen-powered Chevrolet Equinox vehicles to demonstrate the emerging technology.

Daniel O'Connell of the auto maker's fuel cell lab in Honeoye (HUHN'-ee-oy) Falls, near Rochester, says GM is working with state energy officials on developing a series of filling stations across the state, with the hope they will be in place before widespread production of fuel-cell vehicles in the next five or six years.

The cars use no gasoline and produce no harmful emissions.

GM has 100 test vehicles on the road.