Talk:FORD FUSION (STEWART-HAAS RACING)/@comment-79.117.140.176-20170221012022/@comment-77.20.253.33-20170221022408

wikipedia :

On the faster speedways and superspeedways used by  NASCAR, and  ARCA two or more vehicles can race faster when lined up front-to-rear than a single car can race alone. The low-pressure wake behind a group's leading car reduces the aerodynamic resistance on the front of the trailing car allowing the second car to pull closer. As the second car nears the first it pushes high-pressure air forward so less fast-moving air hits the lead car's spoiler. The result is less drag for both cars, allowing faster speeds.