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The 15th World Congress on Intelligent Transportation Systems features 10,000 transportation and technology experts.

This year, the group includes members of the city's Department of Transportation, who are showcasing the future of city transit.

Organizers say the group is looking at solutions to reduce congestion, improve the environment and even prevent crashes and save lives.

"The vehicles communicate between each other, the vehicles communicate to the roadside traffic signals and other devices, and therefore provide the drivers warnings of pending accidents," says Patrick McGowan of ITS World Congress. "The vehicles will warn the drivers, they'll stop themselves and prevent the accidents. So it's an amazing group of technologies."

A popular innovation are interactive cars that get radio signals to communicate road conditions.

"We already have a 4.9 mile loop around Manhattan that's already been equipped with these radios and the vehicle will communicate with the roadside devices giving travel time information, construction information, pending hazards," says Gowan.

A Mercedes Benz on display knows when the light is red and automatically stops in front of the light.

"Basically, the car assesses the danger of a distracted driver going through a red light, so almost by magic, the car stops," says Luca DelGrossi of Mercedes Benz.

A Honda model on display can warn drivers if they're on course for a collision.

Another mass transit system alerts mobile phones about best routes to destinations, as well as whether bus or subway systems are experiencing more traffic.

"We've got sensors of vehicles, sensors on trains, ubiquitous sensors all over the community," says Paul Brubaker of the U.S. Department of Transportation. "The phone will automatically know where you are, so it'll go from my current location to 33rd [Street] and Broadway, it'll plot the most efficient route, give you some options."

The same system can also warn cars about pedestrians crossing the street,

Autonomous vehicles, or cars without drivers, are also among the highlights of this year's expo.

"We have sensors in the front and rear of our vehicle that detect certain things," says Ryan Lamm of the Southwest Research Institute. "And we have laser scanners as well as cameras that allow us to sense and perceive the environment that information is fed into the brain of the vehicle, a computer, that makes decisions."

Event organizers say what prevents the technology from being used on the road is that car manufacturers need to install it and cities and states need to wire the streets to make it all work.

The show runs until Thursday. For more information, visit www.itsworldcongress.org.