>> well, they are asking that these vehicles have these vehic technology placed inside of it, so thatow that, hey, this vehicle is coming my way. the concern is that these cars are awfully quiet and pedestrians are possibly going to be injured, because they don't know that this vehicle is on its way, wolf. they're green, fuel efficient, but too quiet, and a potential threat to cyclists and pedestrians. that's what the department of transportation says about hybrid and electric cars. the federal agency just proposed rules that would require new, green vehicles make sounds, loud enough to alert pedestrians and cyclists, like george abbott. >> i have experience going alongside them and not realizing that there was one there. >> reporter: it's what's under the hood that makes these hybrid and electric cars so quiet on the road. this nissan leaf already has technology similar to what the government wants in all electric and hybrid cars. do you hear that sound? well, the government believes that it could save lives. eddie george sells the vehicles in maryland. >> the car is very quiet. you