Under even the most - aggressive test driving assumptions, it would take existing fleets of autonomous vehicles tens and even hundreds of years to log sufficient miles to adequately assess the safety of the vehicles when compared to human - driven vehicles, according to the analysis. (greencarcongress.com)
Expand infrastructure connected with existing fleets, public transit, and transportation corridors; and (greencarcongress.com)
«The world has a huge existing fleet of existing coal plants,» Mr. Sandalow said. (dotearth.blogs.nytimes.com)