Boston officials Thursday showed a mix of skepticism and opposition to driverless cars, suggesting that Waymo and other driverless car companies looking to operate in the city may struggle to get the green light.

The comments came across a pair of events including a rally organized by the App Drivers Union, Teamsters Local 25 and other labor groups, and a four-hour city council committee hearing on autonomous vehicles potentially operating in Boston. Multiple voices slammed the presumed threat to rideshare jobs and to drivers who depend on that income.