NASCAR Pit Stop Rules: Crew Limits, Speeding and Penalties

The Next Gen car arrived in 2022 with one wheel nut on each wheel, and a pit stop that had required twenty lug nuts on a four-tire change suddenly required four. Crews that had spent years drilling with air guns that spun five nuts per corner had to relearn the job from the first step. Stops got faster, and the penalties that NASCAR had built around the old ones got sharper.

The core NASCAR pit stop rules for the Cup Series are simple to state. Five crew members may go over the wall during a stop: a jackman, two tire changers, a tire carrier and a fueler. Each track has its own pit road speed limit, measured by timing lines along pit road, and a car that exceeds it is penalized. A crew that lets a tire roll free, sends a sixth person over the wall, or leaves equipment outside the pit box is penalized too. Under green, the penalty is a pass-through on pit road. Under caution, the car goes to the tail of the field for the restart. A wheel that comes off on the track draws a heavier sanction still. The rest of this guide takes each of those in turn.

Who goes over the wall: five crew members and the 2018 cut from six

For most of the 2010s a Cup team sent six people over the wall. For 2018 NASCAR cut the number to five, and the work that the sixth person had done was redistributed among the remaining crew. Teams that had built their stops around six bodies had to choreograph new ones in a matter of weeks.

The five positions are fixed in name if not always in every detail of what they do.

The five jobs

Position	What the crew member does
Jackman	Lifts each side of the car with a manual hydraulic jack, right side first, then left, and drops it when the tires are on
Front tire changer	Removes and refits the front wheels using the air gun on the single center nut
Rear tire changer	Removes and refits the rear wheels the same way
Tire carrier	Brings the fresh tires from the wall, hangs them on the hub and handles the used tires
Fueler	Empties fuel from the can into the car's fuel cell and takes no other role

The fueler's position is the most tightly restricted. The fueler handles fuel and does not help change tires. A second crew member is allowed to stand at the wall with a second fuel can for a full fill, but that person does not go over.

NASCAR also took control of the tools in 2018, supplying a standard air gun to every team so that nobody could find time by building a faster one. On the Next Gen car the gun works on a single center-locking nut rather than five lug nuts per wheel.

Why the cut mattered

Six people made a stop simpler. Each crew member had a clear task and nobody had to cover for anybody else. At five, the work had to be redistributed and the sequence tightened, and crews spent the early part of 2018 relearning stops they had run for years. Once the new choreography settled, the times came down again.

The cut also changed hiring. A team that needs fewer crew members per car needs athletes who can do more than one job well, which pushed the recruiting of former college athletes even harder.

A sixth person over the wall is a penalty. That includes a crew member who jumps the wall to chase a loose tire or retrieve equipment. Whoever is on the pit road side of the wall when the car is being serviced counts toward the limit.

What a four-tire stop looks like on the Next Gen car

A four-tire stop with fuel takes under ten seconds of time stationary on the Next Gen car when nothing goes wrong. The car arrives at its box and stops between the painted lines. The crew goes over the wall as it arrives.

1. 1ArrivalThe driver stops the car inside the painted lines of the pit box and the crew goes over the wall.
2. 2Right side upThe jackman lifts the right side and the two tire changers loosen the single nuts on the front and rear right wheels.
3. 3Right side swapThe old wheels come off, the tire carrier and changers hang the new ones, and the changers tighten the nuts.
4. 4Over to the leftThe jackman drops the right side, crosses to the left, and lifts it while the changers follow.
5. 5Left side swapThe left wheels are changed the same way while the fueler empties the can into the car.
6. 6ReleaseThe jackman drops the car, the crew steps back, and the driver accelerates out of the box to the speed limit.

The order on the Next Gen car with its single center-locking wheel nut. Exact choreography varies from team to team.

The single center-locking nut

The old car had five lug nuts per wheel, and the changers ran an air gun across them in a pattern that took a second or more per wheel. On the Next Gen car each wheel is held by one large nut at the center of an 18-inch wheel. The gun has to engage, spin the nut off, and spin the new one on. The number of things that can go wrong is smaller, but each one counts for more: a nut that is cross-threaded or not fully tight is a wheel that can come off on the track.

The jack on each side

The manual jack is the slowest tool in the stop. The jackman places it under the car's jacking point, pumps it to raise the side, and drops it when the changers are done. The right side, the side away from the wall, is done first, and the jackman then runs around the front of the car to the left. It is one crossing, and a slow one costs the whole crew.

Why stops are under ten seconds now

Speed comes from fewer nuts, practice and the five crew members working in a fixed choreography. A team rehearses the stop many times a week. A time stationary of under ten seconds is routine for the best crews, and a stop that runs much longer is usually a stop where something went wrong. The car itself, from its single-source parts to its independent rear suspension, is set out in our guide to the Next Gen car NASCAR introduced in 2022.

The NASCAR pit road speed limit: one per track, measured in segments

There is no single pit road speed limit in NASCAR. Each track has its own, set according to how long pit road is, how tight its entry and exit are and how many stalls it holds. The limits run from about 30 mph at the tightest short tracks to around 55 mph at the biggest speedways, and NASCAR announces each track's figure before the race weekend.

The limit applies from the start of pit road to its end, which is marked by lines painted on the surface. It applies in the box as well, so a driver who arrives too fast is penalized even if the stop itself is clean.

How speed is measured

NASCAR does not use radar. It uses timing lines, which are scoring loops embedded in pit road at intervals along its length. Each car carries a transponder, and when the car crosses a loop, the time is recorded. The system calculates the car's average speed between each pair of loops. If the average in any segment exceeds the limit, the driver is penalized.

That means a driver who goes slowly in one segment and then fast in the next is caught in the second. A driver cannot average out a burst of speed by running slowly elsewhere.

NASCAR allows a small tolerance above the posted limit and does not publicize the exact figure. In practice the drivers know where the edge is, and they push to it.

No speedometer in the car

A Cup car has no speedometer. Drivers judge pit road speed from engine RPM, since in a known gear, a given engine speed corresponds to a given road speed. Before the race the drivers follow the pace car around at pit road speed and note which RPM corresponds to the limit in the gear they will use on pit road.

Teams program the car's digital dash to light up when the car is at or near that RPM. The lights let a driver watch the dash instead of the tachometer needle. It still requires judgment, because the RPM changes with tire size and with how the car is geared for that track.

Why speeding happens anyway

Pit road is where races are won and lost on track position, and every fraction of a second matters. A driver who goes slightly faster on entry, or accelerates slightly earlier on exit, gains time. A driver who goes too fast loses the race. Speeding penalties are among the most common in NASCAR for that reason.

The penalty list for a live pit stop

The most common pit road penalties all have the same goal: to keep pit road safe for the crews and drivers working on it. Pit road is a crowded, narrow space where forty cars and their crews are working within a few feet of one another, and anything that leaves a pit box, whether a tire, a jack, a hose or a car, can hurt somebody.

Violation	What it means	Penalty under green	Penalty under caution
Speeding	Average speed in any timing segment above the limit	Pass-through on pit road	Restart from the tail of the field
Uncontrolled tire	A tire leaves a crew member's control and rolls away from the box	Pass-through	Tail of the field
Too many crew over the wall	More than five crew members on the pit road side during the stop	Pass-through	Tail of the field
Crew over the wall too soon	A crew member goes over before the car is close enough to its box	Pass-through	Tail of the field
Equipment leaving the pit box	An air gun, jack or other tool is carried or rolls out of the box	Pass-through	Tail of the field
Pitting outside the box	The car is serviced while not within the lines of its assigned box	Pass-through	Tail of the field
Commitment line violation	The car crosses the line that marks the decision to enter pit road	Pass-through	Tail of the field

Uncontrolled tire

This is the most common penalty after speeding. A tire that rolls free is a hazard. It can roll into pit road, where cars are entering and leaving at speed, or into a neighboring box where another crew is working. So NASCAR requires that crew members keep tires under control at all times. Officials judge the violation from overhead video of each box. A tire that rolls a short way and is grabbed is not always called; a tire that rolls across pit road always is.

Commitment line

At the entrance to pit road, NASCAR places a commitment line, sometimes marked with a cone, to separate cars going onto pit road from cars staying on the track. Once a driver is committed to the pit road side, he must go down pit road. Crossing back over the line is a penalty. The rule prevents a driver from feinting toward pit road and then changing his mind at the last moment, which could cause a crash with cars that had already committed.

The broader structure of NASCAR penalties, from inspection failures to the L1 and L2 tiers, is explained in our guide to how NASCAR penalizes teams and drivers.

How penalties are served: pass-through, the tail, and a wheel off on track

The penalty is the same violation whatever the flag. What changes is how it is served.

Under green: the pass-through

Under green, the standard penalty is a pass-through. The driver must come back down pit road at the speed limit, without stopping, and return to the track. The cost is the time it takes to drive pit road at the limit compared with the time to drive the same distance on the track at speed, which at many tracks approaches a lap. At a short track with a long pit road, it can cost more.

A driver who speeds during the pass-through earns a further penalty. The escalation is designed to keep anyone from treating a pass-through as an opportunity to make up time.

Under caution: the tail of the field

Under caution, the cars are not racing, so a pass-through would cost very little. Instead, the penalized car is sent to the tail of the field for the restart. The driver loses all the positions gained on pit road and more besides. At a superspeedway or an intermediate track this is often less costly than a pass-through under green, since a restart offers chances to move up. At a short track it can bury a car for the rest of the stage.

A wheel that comes off on track

The heaviest pit road sanction is for a wheel that comes off the car on the track. With the Next Gen car's single nut, a wheel that is not fully tightened is more likely to come off than one held by five nuts, and a wheel bouncing down the track at speed is a serious danger to other drivers and to spectators.

The penalty therefore comes in two parts. In the race, the car loses laps under the in-race penalty table. After the race, NASCAR suspends crew members responsible for the wheel. When the Next Gen car was new, the suspension reached the crew chief as well as the changer and the jackman. For 2023 NASCAR revised the rule so that the suspension applied to the two crew members and not the crew chief, and it has adjusted the details since. The current version appears in each season's rule book and penalty guidelines.

When pit road is open, when it closes, and who may stop first

Under green, pit road is open at all times. Any car may stop whenever its crew chief decides. A green-flag stop costs a lap or more, depending on the track, because the field keeps racing while the car is stationary.

When a caution falls, the situation changes immediately.

1. 1Caution calledThe yellow flag waves and pit road closes at once, shown by a red light at the pit road entrance.
2. 2Field slowsThe pace car picks up the leader and the field forms up behind it at reduced speed.
3. 3Pit road opens for lead-lap carsNASCAR opens pit road and only cars on the lead lap may stop on this pass.
4. 4Lapped cars stopOn the next time by, cars not on the lead lap may come down pit road for service.
5. 5Free pass and wave-aroundsThe first car one lap down regains its lap, and eligible lapped cars may be waved around the pace car.
6. 6Restart order setCars line up by their running position at the end of the caution, with penalized cars at the tail.

The standard sequence for a full-course yellow in a Cup race. Emergency service under a closed pit road is permitted but carries its own penalty.

Why pit road closes when a caution falls

Before NASCAR closed pit road under a caution, drivers raced back to the line to beat each other to pit road, sometimes at full speed past a crash. The closure removes that incentive. The field slows, the pace car comes out, and nobody may pit until NASCAR decides the field is under control.

A car that enters pit road while it is closed, for any reason other than an emergency, is penalized and restarts at the tail. A car with a genuine emergency, such as a car about to run out of fuel or with a flat tire, may come in for service while pit road is closed, but it still restarts at the tail.

Lead-lap cars first

The order exists because of track position. Lead-lap cars pit first so that they keep their positions relative to one another. Lapped cars pit next, and they lose nothing relative to the lead-lap cars because they are already behind. The free pass, the first car one lap down, regains its lap and lines up at the back of the lead-lap cars. The rules for these procedures, and the flags that signal them, appear in our guide to what each flag in NASCAR means.

Pit stall selection: why qualifying decides where a car stops

Every car in a Cup race has an assigned pit box for the race. The boxes are chosen in order of qualifying, with the fastest qualifier choosing first, and the slowest choosing last from whatever is left. Qualifying therefore decides two things: where the car starts, and where it will stop for the rest of the race.

Why the stall matters

A pit stall is not a neutral space. Some stalls are easier to get into and out of than others, and the time saved over several stops can add up to a position or two at the end of the race.

The stall nearest the pit road exit is the most prized. A car in that box does not have to drive past other boxes to leave, so it does not have to slow down for a crew member walking back to the wall or a car pulling out in front of it. It also means the car leaves pit road first among those that stopped at the same time, which helps in a close race off pit road.

What an opening is worth

A stall with an opening in front of it, such as an empty box, a gap in the pit wall or a break where a crossover gate sits, lets the driver drive straight out of the box without turning the wheel. That saves time and reduces the risk of hitting the car in front.

The stall nearest the start of pit road has its own advantage at some tracks: the driver can pull straight into it without having to slow for other cars already in their boxes ahead. Which end is better depends on the layout of the particular track, and teams study each pit road before deciding.

How qualifying works at each kind of track, and how rain affects the order, is set out in our guide to the NASCAR qualifying format.

Two tires, four tires or fuel only: the crew chief's choice

The crew chief makes a choice on every stop: how much service to take. The options are roughly three.

Four tires and fuel. The full stop. It takes the longest, under ten seconds stationary on a good day, and it gives the car the most grip for the next run.

Two tires and fuel. Usually the right-side tires, which wear faster on an oval because the car leans on them through the turns. A two-tire stop is shorter, so the car leaves pit road ahead of cars that took four. It then has to defend on older left-side tires.

Fuel only. The shortest stop. The car leaves pit road ahead of everyone who took tires. It is the most aggressive call and the riskiest, because the car will be on the oldest tires in the field.

The trade: track position or tires

The choice is a trade. Fewer tires means better track position, which matters a great deal at tracks where passing is hard. More tires means more grip, which matters at tracks where the tires wear fast and a car on fresh rubber can carve through the field.

How the call changes by track

At a superspeedway, tire wear is minimal and track position matters more, so two-tire and fuel-only stops are common. At a track with an old, abrasive surface, such as Darlington, tires wear quickly and four-tire stops are almost always the choice. At an intermediate oval, the call depends on how many laps remain and how fast the tires are falling off. A two-tire stop late in a race at an intermediate oval often decides the result.

The end of a stage is another moment for the call. Stage points go to the top ten at the end of every stage before the last, and a crew chief who stays out to collect them may then pit when the rest of the field has already stopped. The choice is covered in our guide to the way NASCAR's stages shape strategy.

Fuel: the can, the fill and the fuel window

The fuel can holds about 11 gallons, and a full fill of the Next Gen car's fuel cell from close to empty takes two cans. That is the main reason a second crew member stands at the wall: one fueler goes over the wall with the first can, empties it into the car, hands it back over the wall, and takes the second.

The can is self-venting, so fuel flows into the car without anyone having to catch overflow. On older cars, a separate crew member called the catch can man held a can at the vent to collect the fuel that came out. The self-venting can made that position unnecessary, and it disappeared well before the 2018 cut to five.

The fuel window

The fuel window is the number of laps a car can run on a full tank. It depends on the track, on how much fuel the car burns at that track, and on how hard the driver is pushing. At most tracks the window is long enough that the race breaks into a predictable number of stops.

• 5Crew members allowed over the wall
• 6Crew members allowed before 2018
• 1Wheel nuts per wheel on the Next Gen car
• 5Lug nuts per wheel on the previous car

Crew limits are from the NASCAR rule book; the fuel can figure is approximate and the number of cans needed varies with how much fuel the car has left.

How the fuel window sets the shape of a race

The fuel window decides when stops happen. If the window is, for instance, about 80 laps at a track where the race is 300 laps, the field will need at least three stops. Crew chiefs plan the race around those stops, and the stages and cautions disrupt the plan. A caution near the end of a fuel window is a gift; a caution just after a green-flag stop is a disaster. At the end of a race, a car that can finish without stopping for fuel can gain track position on cars that cannot, which is why fuel-mileage finishes are common at intermediate ovals.

The damaged vehicle policy: a clock on pit road

NASCAR introduced the damaged vehicle policy in 2017. It applies to cars with accident damage, not mechanical failures.

Under the policy, a car with damage from a crash or contact goes to its pit box, and the crew has a fixed time to repair it on pit road. The clock started at five minutes when the policy began and has been lengthened more than once since, so the figure for a given season is the one in that year's rule book. If the crew finishes in time, the car returns to the track and must reach a minimum speed set for that track. If it cannot reach the minimum speed, it is out of the race.

What may be fixed on pit road

The crew may repair damage with the tools they have on pit road: tape, hammers, cutters and similar. They may not hang new body panels or replace major parts in the pit box. The point is to allow repairs that get a lightly damaged car back on track without turning pit road into a garage.

When a car has to go to the garage

The policy is strict: a car that goes behind the wall with accident damage is, as a rule, finished for the day. The precise conditions are set out in each season's rule book, and NASCAR has adjusted the details of the policy more than once.

The policy forces a crew chief to decide quickly. Can this damage be fixed on pit road in the time allowed? If the answer is no, the car's race is probably over, and where it is classified among the cars that have dropped out still counts for points. A crew that gambles on a repair and runs out the clock gains nothing, so the call has to be made in the first seconds the car is in the box.

Who the pit crews are: former college athletes and full-time training

A Cup pit crew is a group of professional athletes. That has been true for at least two decades, and the change from the old days, when crew members were mechanics who also worked on the car, is complete.

The big teams recruit from college sports. Former football players, especially, fill the jackman and tire-carrier roles, where strength and explosiveness matter most. Basketball and baseball players are recruited for tire changing, which needs hand speed and coordination. The common factor is that the recruits are athletes who are used to training, used to performing under pressure and used to the idea that a fraction of a second matters.

The practice facilities

Hendrick Motorsports, Joe Gibbs Racing and the other large organizations run their own pit crew training programs, with practice pit boxes, weight rooms and coaching staff. Crews practice stops several times a day during the week, film them, and review the film. A stop that is a tenth of a second slower than the team's best is studied to find out why.

The choreography of a stop

The five crew members work in a fixed sequence. Each knows where the others will be at every moment, and each has a precise route around the car. A crew member who is a step out of place can slow the whole stop down. That is why crews change slowly: once five people have learned a choreography together, swapping one of them out means relearning.

How NASCAR stops differ from the F1 and IndyCar versions

NASCAR is not alone in having pit stops, but its version is different from the two other series American fans see most often.

Feature	NASCAR Cup Series	IndyCar	Formula One
Crew over the wall	5	6	Around 20, no fixed small limit
Refueling during the race	Yes, by gravity from cans	Yes, by hose from a pit-side tank	No, banned since 2010
How the car is lifted	Manual jack, one side at a time	Onboard air jacks lift the whole car	Front and rear jacks operated by crew
Wheel fastening	Single center nut	Single center nut	Single center nut
Typical stationary time	Under ten seconds for four tires	Several seconds, set by refueling	Around two to three seconds

Formula One

F1 stopped refueling in 2010, and with no fuel to add, the stop is only about tires. A crew of about twenty changes four wheels in two or three seconds. The rule book's approach to safety in the pit lane is similar to NASCAR's, with penalties for unsafe releases and speeding, but the details differ, and our explainer on the rules of an F1 pit stop covers them.

IndyCar

IndyCar is closer to NASCAR in that it refuels during the race, but it uses a hose and a pit-side tank instead of cans, and the car is lifted by onboard air jacks rather than a manual jack. The time stationary is set largely by how long it takes to refuel, which is why an IndyCar stop looks slow next to F1 and quick next to a full NASCAR stop. The broader rules of the series appear in our overview of how IndyCar works, and the full set of American racing guides is on the United States hub.

Why NASCAR keeps its version

NASCAR could reduce the stop to a few seconds with more crew members and different equipment. It does not because the stop is part of the race. A five-person crew working on a car that has to be lifted twice, refueled from cans and released into traffic produces a stop where something can go wrong, and the variation is part of what makes NASCAR strategy interesting. A perfect stop gains a position. A mistake costs several. That variation is a deliberate choice, and it is a fair one.