"Road testers" refers to people or individuals who try out or evaluate vehicles, such as cars or motorcycles, by driving them on roads to determine their performance, quality, and safety. Full definition
I don't know why it is so difficult for road testers to emphasize this point. (evo.co.uk)
Now he's the chief road tester, driving each car for about 400 miles. (automobilemag.com)
Many of those have been brutal, too, in the hands of road testers in big group tests (including evo Car of the Year) and on trackdays in my spare time, including one at Belgium's tricky Spa circuit. (evo.co.uk)