Endurance racing (motorsport) these classes continued to embrace the endurance format. Multiple drivers per car was an early adaptation as the rigors of endurance racing quickly overcome the abilities of most racing drivers to compete solo, although solo attempts on 24 hour races like Le Mans would continue into the 1950s. The various endurance formats were appealing to manufacturers, not only as alternatives to the expense of Grand Prix racing, but also because of its increased relevance to road going models. In automobile endurance racing, three events have come to form a Triple Crown. They are considered three of the most challenging endurance
Motor Racing Network 4 at most tracks, the backstretch at Dover, turn 2 at Pocono, the backstretch turn complex at Watkins Glen and the backstretch at Daytona and Talladega. Both men also work these same positions for the Xfinity and Truck Series when they share the same track and weekend with the Sprint Cup Series as well as standalone Xfinity and Truck races (usually road course races that aren't shared with the Sprint Cup Series (like Road America)). Motor Racing Network The Motor Racing Network (MRN) is the principal radio broadcasting operation of the National Association for Stock Car Auto Racing (NASCAR), promoting