4 of 9
BACKNEXT
GM's 512-series experimental cars weren't considered safe or fast enough to mix with general car traffic.
In contrast to the Electrovair, GM's 512 Series Urban Cars (the blue, red and yellow cars pictured at right) weren't designed for real roads.

"The three cars, with their 30 to 40 mph top speed and limited acceleration, would operate either on a paved road system of their own or in reserved lanes of existing roads, because they could not mix safely with today's freeway of boulevard traffic," GM said in a 1969 press release.

Each car had a different drive system. The blue car, the 512 Hybrid, was a gasoline-electric hybrid vehicle. The red car was an all-electric car and the yellow car ran on a 12-horsepower 19.6 cubic inch (0.3-liter) two-cylinder engine. The silver three-wheeled car on the far right was the gasoline-powered 511 Commuter Vehicle.

GM featured the cars in a 1969 media event called the "Parade of Power." The show highlighted the automaker's research into various forms of alternative propulsion. Also included were jet-powered cars, a steam-powered Pontaic Grand Prix and an exhibit on "nuclear reactor systems as possible means of powering vehicles."

NEXT: Electrovette

Last updated April 07 2009: 2:19 PM ET
More Galleries
6 products to keep the skies friendly Plane travel can be stressful, especially during the holidays. These things can help keep the peace among travelers. More
2014: Helluva good year for stocks The bull market has been going for 2,115 days. If you put you're money in stocks, it's been a very happy year. More
7 up-and-coming foodie destinations These seven cities are seeing a growing interest in local food boost the economy -- and produce some seriously tasty eats. More

Special Offer

Most stock quote data provided by BATS. Market indices are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer.

Morningstar: © 2014 Morningstar, Inc. All Rights Reserved.

Factset: FactSet Research Systems Inc. 2014. All rights reserved.

Chicago Mercantile Association: Certain market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved.

Dow Jones: The Dow Jones branded indices are proprietary to and are calculated, distributed and marketed by DJI Opco, a subsidiary of S&P Dow Jones Indices LLC and have been licensed for use to S&P Opco, LLC and CNN. Standard & Poor's and S&P are registered trademarks of Standard & Poor’s Financial Services LLC and Dow Jones is a registered trademark of Dow Jones Trademark Holdings LLC. All content of the Dow Jones branded indices © S&P Dow Jones Indices LLC 2014 and/or its affiliates.