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At a glance
- Driver Lineups: A minimum of two drivers per car for every race, with three to four drivers permitted in long-distance endurance events (Daytona International Speedway, Sebring International Raceway, Watkins Glen International, and Michelin Raceway Road Atlanta).
- Pit Wall Crossing: Crew members must remain behind the pit wall until the car is fully stationary in its pit stall.
- Dedicated Driver Helper: Exactly one crew member is permitted over the wall specifically to assist the driver change.
- Assistance Scope: The helper assists with driver egress, seat inserts, safety belts, air hoses, radio connections, and drink tubes.
- Pit Lane Limits: A 60 km/h pit-lane speed limit is strictly enforced, with violations penalized by drive-through penalties or black flags.
In endurance sports car racing under IMSA regulations, driver changes are governed by strict crew limits, safety protocols, and lineup requirements. Regulations mandate a minimum of two drivers per entry for standard events, expanding to three or four drivers for major endurance races at Daytona International Speedway, Sebring International Raceway, Watkins Glen International, and Michelin Raceway Road Atlanta. Crucially, no crew member may cross the pit wall until the car comes to a complete stop in its pit box. While four designated crew members handle routine servicing such as tires and refueling, IMSA permits only one dedicated crew assistant over the wall to help with driver changes, connecting the incoming driver's safety harness, radio, air hoses, and drink tube.
Over-the-Wall Crew Restrictions and Driver Helper Duties
IMSA strictly regulates the personnel allowed over the pit wall during a stop. No crew member is allowed to step over until the car comes to a complete halt in the pit stall. Once stopped, four designated crewmen perform routine servicing—such as tire changes and refueling—as well as any necessary mechanical repairs like changing brake pads or adjusting aerodynamic wings.
When a driver swap occurs, IMSA rules permit a single designated crew member over the wall solely to assist the drivers. Cockpits in modern sports cars are tightly packaged, requiring meticulous choreography to execute the swap. The driver change helper assists the outgoing driver in unbuckling and exiting, places custom seat inserts when required for teammates of differing builds, and helps the incoming driver fasten multi-point safety harnesses. The helper also connects critical driver infrastructure, including two-way radio wiring, air hoses, and hydration drink tubes, ensuring the car departs safely without loose equipment.
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Driver Lineup Requirements and Endurance Stints
IMSA regulations mandate a minimum of two drivers for every championship event. For major endurance rounds at Daytona International Speedway, Sebring International Raceway, Watkins Glen International, and Michelin Raceway Road Atlanta, teams expand their rosters to three or four drivers to manage driving time across long distances. In qualifying, only a single driver is permitted to qualify the car during the timed session (20 minutes for GTP and 15 minutes for other classes), and causing a red flag results in the loss of that driver's fastest lap.
During the race, teams must balance seat time and ensure each co-driver completes required driving stints while navigating intense physical strain. Drivers such as BMW M Team RLL's John Edwards have noted that while heart rates remain stable during long night stints at Daytona, physiological stress spikes sharply the moment the car enters pit lane. Drivers must unbuckle, leap from the cockpit, and navigate an active pit road with moving machinery, flying tires, and cars dropping off air jacks.
Pit Lane Speed Limits and Strategic Execution
IMSA strictly enforces a 60 kilometers per hour pit-lane speed limit for all cars driving in the pit lane. Anyone caught speeding must serve a drive-through penalty down pit lane or risk being black flagged during the race.
Because routine refueling and four-tire stops in IMSA typically take less than 25 seconds, driver changes must be completed within the fueling window to avoid losing track position. As Paul Miller Racing's Bryan Sellers has highlighted, executing a seamless driver change in 25 to 30 seconds can unlock crucial tactical advantages, such as allowing a team to take only two tires during a stop without waiting on the cockpit switch. Drivers and teams rehearse the choreography extensively in garages and pits, as any hesitation or botched belt connection can squander a hard-earned lead.
Related reading: MotoGP White Flag Bike Change Rules: When Riders Can Swap; Does MotoGP White Flag Mean Mandatory Bike Change? Flag-to-Flag Rules Explained.
Sources: WeatherTech: Understanding The Sport | IMSA; Art of the Driver Change: Poetry (or Comedy) in Motion | IMSA.