Did not finish

Lore & Background

In auto racing, a DNF usually occurs due to mechanical failure, an accident, or driver fatigue. In skiing, especially downhill and super-G, a DNF can denote an athlete who loses control and crashes off their skis, or who skis out by missing a gate, resulting in instant elimination even in multi-run events. In off-road racing, a DNF may cost a team a points championship, though more races in a season increase the chance another team will also DNF, allowing a championship and purse to still be won.

Reader's Guide

In swimming, a DNF occurs when a swimmer starts a race but fails to complete it due to injury, race stoppage without re-run, or rarely by voluntarily leaving the pool. In less formal settings, a DNF may be recorded instead of a disqualification for longer events such as the 400m, 800m, and 1500m Freestyle, and the 200 Butterfly. In speedcubing, a DNF most often occurs when a competitor fails to solve a puzzle, defined as being more than one move away from solved, or due to other regulation infractions or disqualification. Scholarly research has examined DNF rates: in track and field, a study found a 22% overall DNF rate among high-level decathlon competitors, with individual event rates from less than 1% to over 6%. A New York Times analysis of the New York City Marathon concluded that recreational competitors were more likely to finish than elite runners, and visiting runners were more inclined to finish regardless of time. Studies have also found statistically different nutrition and liquid intake between finishers and DNFs in ultramarathons, and physiological differences between finishers and DNFs among horses in long-distance races.

Did You Know?

• In speedcubing, a DNF is defined as being more than one move away from a puzzle's solved state.
• A New York Times analysis of the New York City Marathon found that elite runners were more inclined to drop out than recreational competitors.
• In off-road racing, a DNF can cost a team a points championship, but more races in a season increase the chance another team will also DNF.

Qualifying Standards and Performance Thresholds

The 107% rule stands as a cornerstone of competitive racing, particularly in Formula One, where a driver must set a qualifying lap within 107% of the fastest time to earn a spot on the grid. This threshold acts as a performance gate, ensuring that only cars demonstrating adequate pace are permitted to compete. The rule also functions as a monitoring tool, with variations used to warn drivers who are falling short of required pace before they face disqualification. Other series adopt their own versions of this concept: IndyCar employs a 105% rule, while NASCAR uses a 115% threshold. These differences reflect the varying performance envelopes of each series. Notably, IndyCar and NASCAR will adjust their qualifying thresholds for tracks with particularly abrasive surfaces, such as Atlanta Motor Speedway, where less-worn tires can produce significantly faster lap times. This flexibility acknowledges that track conditions and tire wear can distort raw time comparisons, making a rigid percentage less meaningful in certain environments.

Drag Racing Culture and Terminology

Drag racing has cultivated a dense vocabulary that distinguishes it from other motorsport disciplines. The 60-foot time measures how quickly a vehicle covers the first 18 meters of the strip, serving as a critical indicator of initial acceleration. At the starting line, the beam—an electric eye—controls the pre-stage and stage lights, while a perfect reaction time of zero seconds earns the colorful nickname "bag of donuts." Before the race, drivers head to the bleach box, an area where they perform burnouts to heat their tires for optimal traction; historically gasoline was used here, though safety concerns led to its discontinuation, with water and TrackBite becoming the permitted alternatives. The bottle, also called a jug, holds the nitrous gas cylinder for injection, while the blower refers to a supercharger that was often marketed in the 1990s as a "power adder" alongside turbochargers and nitrous systems. An engine fitted with such a supercharger is described as "blown," a term that unfortunately doubles as slang for catastrophic mechanical failure.

Track Geometry and Mechanical Limits

Understanding track geometry is essential for grasping how racing cars interact with their environment. The apex represents the point in a corner where the racing line comes closest to the inside of the bend, dictating the optimal trajectory through a turn. Banking describes the angle at which a track surface inclines toward the outside of a corner, a feature that can also be described as camber when the angle is modest or negative, sometimes called "off-camber." The apron is the strip of asphalt or concrete separating the racing surface from the infield, while the blend line is a painted marker defining where the pit lane rejoins the track, preventing cars from merging into live traffic at insufficient speed. On the mechanical side, bottoming out occurs when the underside of the chassis makes contact with the track surface, while a blowover is the dramatic flipping of a vehicle caused by excessive aerodynamic force beneath the chassis. Both represent physical limits that can end a driver's session abruptly.

Race Formats and Competition Structures

Motorsport encompasses a wide variety of competition formats, each with its own terminology. In midget car and sprint car racing, particularly at short tracks, the "alphabet soup" describes the gauntlet of preliminary heat races a driver must navigate to reach the feature event, progressing from the O main through N, M, L, K, J, I, H, G, F, E, D, C, B, and finally the A main—a format exemplified at events like the Chili Bowl Nationals. A 1–2 finish occurs when two cars from the same team occupy the top two positions, extendable to 1–2–3 or beyond depending on team size and series rules. The n-stop strategy refers to the planned number of pit stops a driver will make during a race. In kart racing, the arrive-and-drive format means the competitor neither owns nor manages the vehicle, which is simply provided upon entry. At the other extreme, The Big One describes a massive multi-car pileup involving up to 30 vehicles, a phenomenon largely associated with restrictor plate racing at Daytona and Talladega.