Self-driving cars are coming, and Americans are getting on board, according to a study from the University of Michigan, CNNMoney reported

The study found that 56 percent of U.S. respondents had positive opinions of self-driving vehicles.

 

On the other hand, 29 percent of the respondents hadn't heard of driverless technology before they were contacted for the study.

 

After working on the technology for several years, Google Inc. unveiled a self-driving prototype in May. The system probably won't be widely available for five or six years, but executives have predicted that one day "a significant number of cars will carry Google technology." Nissan Motor Co. said last year that it hopes to have a self-driving car on the market by 2020.

 

California, Nevada, Florida and Michigan have passed legislation allowing the testing of self-driving cars on public roads, and the National Highway Traffic Safety Administration has issued advisories for driverless road tests

  

In Iowa, Johnson County approved regulations for driverless cars in July.