For the Gartner Consumer Trends in Automotive study, researchers surveyed 1,519 people in the U.S. and Germany and found that 55 percent of respondents said they wouldn’t ride in a fully autonomous vehicle, and nearly half said they would not consider giving up their own vehicle, even if it could save 75 percent over the cost of owning a car.

“Fear of autonomous vehicles getting confused by unexpected situations, safety concerns around equipment and system failures, and vehicle and system security are top concerns around using fully autonomous vehicles,” Mike Ramsey, research director at Gartner, said in a statement.