Finally, 16% of experts believe that greater use of AVs will have a negligible impact on overall vehicle use because other modes will adopt automation technologies in order to compete with AVs, thus offsetting the growth potential of the private use of AVs. The top barriers to the uptake of autonomous cars that experts identified include safety and security issues, technological challenges, and legislation and regulatory issues. Of the electric vehicle (EV) fleet, full-battery EVs are expected to comprise the highest share of vehicles by 2050.