(Bloomberg) – Brian Lesko and Dan Sherman hate the idea of driverless cars, but for very different reasons.

Lesko, 46, a business-development executive in Atlanta, doesn't trust a robot to keep him out of harm's way. "It scares the bejeebers out of me," he says.

Sherman, 21, a mechanical-engineering student at the University of Minnesota, Twin Cities, trusts the technology and sees these vehicles eventually taking over the road. But he dreads the change because his passion is working on cars to make them faster.

"It's something I've loved to do my entire life and it's kind of on its way out," he says. "That's the sad truth."

The driverless revolution is racing forward, as inventors overcome technical challenges such as navigating at night and regulators craft new rules. Yet the rush to robot cars faces a big roadblock: People aren't ready to give up the wheel. Recent surveys by J.D. Power, consulting company EY, the Texas A&M Transportation Institute, Canadian Automobile Association, researcher Kelley Blue Book and auto supplier Robert Bosch LLC all show that half to three-quarters of respondents don't want anything to do with these models.

Hopes for rapid rollout of autonomous vehicles

"Technologically, we will be ready for automated driving within this decade," said Kay Stepper, a vice president and head of the automated driving unit at Bosch, which supplies components to the world's leading manufacturers. "But it will take well into the next decade to convince consumers."

Automakers and tech giants including Alphabet Inc.'s Google unit have high hopes for a rapid rollout of autonomous vehicles, which they say will radically reduce traffic deaths and cure congestion in big cities. Google, which announced plans on Tuesday to expand its test fleet with 100 Chrysler Pacifica minivans, predicts people will be tooling around in robot models by 2020. Boston Consulting Group says the market for autonomous technology will grow to $42 billion by 2025, and self-driving cars may account for a quarter of global sales by 2035.

All of this depends on people buying something they don't currently want. In the Kelley Blue Book study, 75% of the 2,076 people surveyed said they don't think they'll ever own a self-driving car. In the EY study, just 40% could imagine engaging the autopilot, a feature already available on Tesla's sport utility vehicle and sedan and coming soon on models from Audi, Volvo, Mercedes and Cadillac.

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"For certain generations who like to drive, that is going to be difficult to give up.," says Kristin Schondorf, executive director of automotive and transportation mobility at EY. (AP Photo)

Not overwhelming

In a survey released last week, J.D. Power found that just 23% of Baby Boomers would trust self-driving technology. Acceptance improves with younger cohorts, but it's not overwhelming. Less than half of Gen Xers (41%) would trust robot cars, while 56% of Gen Y and 55% of Gen Z are comfortable with the concept.

"It's a little overwhelming for most people," said Kristin Schondorf, executive director of automotive and transportation mobility at EY and a former engineer at Ford Motor Co. and Fiat Chrysler Automobiles NV. "For certain generations who like to drive, that is going to be difficult to give up."

Related: Autonomous vehicles could shrink U.S. personal auto insurance sector by 60%

The biggest obstacle is fear. Consumers who've endured computer crashes as part of their everyday existence are wary of trusting software to keep them safe.

"We're putting a machine — a robot on four wheels — in control of driving us down the road," Stepper said. "Their main concern is that the technology could fail at any point in time. And then what is going to happen? It's this big unknown."

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Drivers' willingness to allow an autopilot to steer their car improves to 66% from 40% if they have the option of taking over the wheel in an emergency.  (Photo: Shutterstock)

No human input

Experience will assuage those apprehensions. But experience is hard to come by right now: Only engineers are testing cars that require no input from humans.

Consumers are getting their first exposure through semi-autonomous features such as automatic brakes, systems that steer a drifting car back into its lane and adaptive cruise control that operates the brake and accelerator to stay a set distance from vehicles ahead. Luxury makers such as Mercedes and Audi soon will introduce traffic-jam assist that takes over in stop-and-go situations.

Related: Women say 'no thanks' to driverless cars, men say 'tell me more' [survey]

Relinquishing complete control is a much greater leap. Drivers' willingness to allow an autopilot to steer their car improves to 66% from 40% if they have the option of taking over the wheel in an emergency, based on the EY study. But safety regulators blame human error for more than 90% of crashes, so it's actually not best to override the robot in a stressful situation, according to Schondorf.