Whether that acknowledgment convinces the public is another matter. More than half of Americans, for example, are "very" or "somewhat" concerned about sharing the road with a driverless vehicle, according to a May 2017 survey by Pew. Another poll this summer, by Advocates for Highway and Auto Safety, a group that last week expressed concern that the Department of Transportation was taking "its hands off the wheel when it comes to safety" with its latest guidance document, found that more than two-thirds of Americans remain skeptical of autonomous vehicles.