Tony Stewart and Lewis Hamilton have completed their car swap at a wet Watkins Glen International.
The NASCAR and Formula One stars completed warmup laps in their own cars, before Hamilton hopped in Stewart's #14 Stewart Haas Racing Chevrolet, completing six laps over the 3.4-mile long course on rain tyres.
Hamilton also did a burnout, much to the approval of the fans at the track.
Stewart then got into the McLaren Mercedes MP4-23 that Hamilton drove to the 2009 F1 title – the same car that TeamVodafone drivers Jamie Whincup and Craig Lowndes drove at Albert Park and Bathurst respectively. Stewart completed four laps. No official lap times were recorded.
The crowd for the free event was estimated at between 8000 to 10,000.