NASCAR creates formula for setting restart zone: NASCAR has established a formula for determining the length of the restart zone on the track. officials will take the pit-road speed limit, double that figure and then set that as the distance in feet of the restart zone. At the start of this season, NASCAR created a zone where the leader must restart the race instead of giving the leader discretion from a certain area coming out of Turn 4 up to the starting line to restart the race. The rule is designed to create a more consistent restart at each track. Pit-road speeds typically range from 30 to 55 mph, depending on the length of the track. That means the restart zone will vary from 60-110 feet, depending on the track. "It will be twice the pit-road speed," Pemberton said. "It's a means to get variable lengths in there for the race track itself. It's something the garage area asked us to do.
Restart Line changes again: NASCAR is still experimenting with new distances for the restart zone. This weekend at Las Vegas Motor Speedway, it’s 90 feet. The zone two weeks ago was 50 feet at Daytona. Last week, it was 110 feet at Auto Club Speedway in California. NASCAR has created the restart zone to limit the area where the leader may restart the event.
