There is a speed limit on pit road. This helps to insure the safety of the pit crew members that will be vulnerable while working on the cars during pit stops. The pit road speed is given and the drivers are given a 5 mph grace period. So if the speed limit is 55 MPH, they are allowed to go 60 MPH without incurring a penalty. If they go even .01 over 60 MPH, they are given a penalty, where they have to pass back down the length of pit road at the while maintaining the proper speed. NASCAR now electronically scores eac car's pit road speed by using timing and scoring areas. They judge a car's speed between each of those areas. JPM was scored going over the 5 MPH grace speed in two of those areas.