The phrase "third driver" usually refers to a person or thing that has a significant influence or impact on a situation, in addition to the two main factors or drivers already present. Full definition
I have said it many times, but our crew is the best third driver we can have. (corvetteracing.com)
Jan Magnussen and Antonio Garcia will be full - season drivers in the No. 3 Corvette C6.R, joined by Jordan Taylor as third driver in endurance events (Sebring, Le Mans, and Petit Le Mans). (olivergavin.com)
Richard Westbrook will reprise his role as third driver in endurance events (Sebring, Le Mans, and Petit Le Mans), and Jordan Taylor will join Corvette Racing for the three long - distance races. (olivergavin.com)