In addition to information, passengers want some control over the vehicle, according to the survey, such as being able to change destination or order the car to pull over.
That doesn't necessarily mean passengers will demand traditional steering wheels and pedals, Ramsey cautions, but they do say they want some way to issue commands — via voice, for instance.
The survey did not indicate a difference in reluctance among young people and older people. Young respondents were just as likely as older people to express doubts about fully self-driving vehicles.
The results are likely to stir the debate over how best to introduce self-driving vehicle technologies to the public.
Tesla, Toyota, General Motors and others are designing self-driving vehicles with traditional controls that allow the motorist to control the vehicle. Others, such as Google and Ford, have voiced doubt that motorists can safely take control if a vehicle encounters trouble.
"People will push the technology to the edge," Ramsey noted.
The Gartner study parallels a AAA survey released in March that revealed most motorists fear the technology.
Seventy-seven percent of respondents in that survey said they would be afraid to ride in a self-driving vehicle, while only 19 percent would trust the vehicle.
On the upside, motorists who own vehicles equipped with collision avoidance features are 75 percent more likely to trust the technology than those who don't, AAA noted.
"This suggests that gradual experience with these advanced features can ease consumer fears," noted Greg Brannon, AAA's director of Automobile Engineering, in a commentary posted on the organization's website.