Section 3: Playing Area
3.1 Track Classifications
NASCAR Cup Series events are held on a variety of track configurations, classified as follows:
- Superspeedways: Tracks of 2.0 miles or greater in length. Currently includes Daytona International Speedway (2.5 miles / 4.023 km) and Talladega Superspeedway (2.66 miles / 4.281 km). These tracks require tapered spacer packages to reduce speeds for safety.
- Intermediate Tracks: Ovals between 1.0 and 2.0 miles in length, including tracks such as Charlotte Motor Speedway (1.5 miles), Las Vegas Motor Speedway (1.5 miles), and Michigan International Speedway (2.0 miles).
- Short Tracks: Ovals under 1.0 mile in length, including Bristol Motor Speedway (0.533 miles / 0.858 km) and Martinsville Speedway (0.526 miles / 0.847 km).
- Road Courses: Tracks incorporating both left and right turns, including Sonoma Raceway (1.99 miles / 3.2 km road course configuration), Watkins Glen International (2.45 miles / 3.94 km), and the Circuit of the Americas (3.41 miles / 5.49 km).
- Dirt Tracks: NASCAR Cup Series events are occasionally held on dirt surfaces, such as Bristol Motor Speedway when prepared as a dirt track for the Food City Dirt Race.
3.2 Pit Road
Pit road is a designated lane adjacent to the racing surface where teams service cars during competition. Each team is assigned a pit stall, the location of which is determined by qualifying position (fastest qualifier receives first choice of pit stall position, continuing in order). Pit stall boundaries are marked and cars must stop within their assigned stall during pit stops.
Pit road speed limits are established by NASCAR for each track and are enforced via the mandatory NASCAR ECM system. Speed limits vary by track:
- Superspeedways (Daytona, Talladega): 55 mph (88.5 km/h)
- Most intermediate and short tracks: 35–45 mph (56–72 km/h), as posted and announced in the driver/crew chief meeting prior to each event
- Road courses: Speed limits are set for specific pit lane segments and announced prior to the event
Drivers must maintain pit road speed from the moment they cross the designated pit road entry cone/marker until they cross the pit road exit cone/marker. Speed enforcement is automatic through the ECM system, and violations result in a drive-through or stop-and-go penalty.
3.3 Start/Finish Line and Scoring Loops
The start/finish line is the official scoring reference for lap completion, race start, and race finish. Inductive scoring loops embedded in the racing surface transmit transponder data to NASCAR's scoring and timing system. Each car carries a NASCAR-supplied transponder that must remain operational throughout the event. The transponder data is the official record for lap times, position, and laps completed.
3.4 Restart Zones
Designated restart zones are marked on the track, typically by painted lines or cones. For double-file restarts, the leader controls the restart and may accelerate anywhere in the designated restart zone. The leader must maintain a consistent speed until reaching the restart zone and may not make sudden deceleration to force following cars to bunch excessively. Cars in the outside lane (on double-file restarts) may not pass cars in the inside lane until the leader crosses the start/finish line (or the restart line, as designated for the specific track).
3.5 Apron and Out-of-Bounds
The apron is the lower portion of an oval track below the racing surface. On most ovals, the apron is delineated by a painted line (the "commitment line" in certain contexts). A car that drops onto the apron during a caution period may be subject to NASCAR's lap-down penalty procedures. On road courses, track limits are defined by white lines or kerbing; NASCAR may penalize drivers who repeatedly use areas outside the defined track limits to gain a competitive advantage.