The original road racing circuit formed a rough triangle running south from Le Mans to Mulsanne, northwest to Arnage, and back north to Le Mans. The founding race, in 1923, initially took cars from the pits on Rue de Laigné straight into the city, around a sharp right-hand hairpin near the Pontlieue bridge over the river Huisne, then out along the section now named Avenue Georges Durand. That early layout measured 17.261 km (10.725 mi) and was unpaved.
A city bypass shortened the circuit in 1929, removing the Pontlieue hairpin. The city was bypassed completely in 1932 with the addition of the section connecting the pits via the Dunlop Bridge and the Esses to Tertre Rouge. This classic 13.492 km (8.384 mi) configuration, with its notoriously narrow pit straight — approximately 3.7 m (12 ft) wide — remained almost unaltered even after the 1955 disaster. The pit straight was widened in 1956 but the track and pits were not separated for a further fifteen years.
The defining feature of the circuit is the Ligne Droite des Hunaudières — the Mulsanne Straight — a 6 km (3.7 mi) section of route départementale D338. After exiting Tertre Rouge, cars ran at full throttle for nearly half the lap before braking heavily for Mulsanne Corner. Speed records accumulated across successive regulations. The Porsche 917 long tail reached 362 km/h (225 mph) between 1969 and 1971. The 1978 Porsche 935 was clocked at 367 km/h (228 mph). Group C prototypes exceeded 400 km/h (250 mph) during the late 1980s. In the 1988 race, Roger Dorchy driving the WM P87 for Welter Racing achieved 407 km/h (253 mph), the highest speed ever officially recorded at Le Mans. Peugeot later advertised the result as "405 km/h" to promote its new 405 road car, causing lasting confusion, but Dorchy's confirmed speed was 407 km/h.
Fatal accidents on the straight — Jean-Louis Lafosse in 1981, Jo Gartner in 1986 — combined with an FIA directive banning circuits with straights longer than 2 km (1.2 mi) led the ACO to insert two equally spaced chicanes onto the Mulsanne Straight before the 1990 race. The fastest qualifying lap average speed fell only from 249.826 to 243.329 km/h by 1992, illustrating how little effect the chicanes had on overall pace despite their dramatic effect on maximum speed.
Car speeds increased through the 1960s and criticism of the classic layout's safety mounted. In 1965, a smaller permanent circuit — the Bugatti Circuit — was constructed sharing the pit lane and the Dunlop Bridge section of the full track. A Ford chicane was added before the pits for the 1968 race. Armco barriers were fitted for 1969. The "Maison Blanche" kink, a particularly fast and harrowing section, claimed several lives including privateer John Woolfe in 1969 in a Porsche 917. In 1971, an Armco barrier finally separated the pit lane from the track. The 1971 event was the last to use the classic circuit configuration.
In 1972, the track was considerably revamped at a cost of 300 million francs: the pit area and first and final straights were modified, the quick Porsche curves were added to bypass "Maison Blanche", and the track was resurfaced. A new public road forced the re-profiling of Tertre Rouge in 1979, creating a faster double-apex corner. Construction at the Mulsanne corner in 1986 required a new track section creating a right-hand kink before the corner. A chicane was added at the Dunlop curve in 1987, slowing cars from 290 km/h (180 mph) to 180 km/h (110 mph) through the section under the bridge.
In 2002, renovation of the Bugatti Circuit led to the section between the Dunlop Bridge and the Esses being transformed from a straight into a set of sweeping fast turns. In 2006, the Dunlop Chicane was moved tighter and the area after it was redeveloped into the larger set of sweeping turns now known as the Esses leading to Tertre Rouge.
Following the death of Danish driver Allan Simonsen at the 2013 race, when his car struck barriers at Tertre Rouge exit — where a tree prevented the guard rail from functioning correctly — Tertre Rouge was re-profiled with the radius moved approximately 200 m inward and new tyre barriers installed. The current circuit configuration (Circuit N°15) has been in use since 2018.
The Bugatti Circuit is a 4.185 km (2.600 mi) permanent track constructed in 1965 and named after Ettore Bugatti. It shares the pit complex, the Dunlop straight, and the Ford Chicane with the full Le Mans circuit, while a purpose-built infield section — featuring Garage Vert, the 'S' du Garage Bleu, and Raccordement — connects back to the Ford Chicane. A junction at La Chapelle directs vehicles either onto the full Le Mans circuit (turning left toward Tertre Rouge and Mulsanne) or continuing on the Bugatti Circuit. The Bugatti Circuit hosted the 1967 French Grand Prix, the only Formula One World Championship event held at Le Mans. It is the current host of the French motorcycle Grand Prix and the 24 Hours of Le Mans motorcycle race.
Up to 85% of the 24-hour circuit lap time is spent at full throttle, placing immense stress on engines, drivetrains, brakes, and suspension. Modern prototype cars achieve average lap speeds in excess of 240 km/h (150 mph). Cars must decelerate from over 322 km/h (200 mph) to around 100 km/h (62 mph) for Mulsanne Corner.
The circuit exhibits an oceanic climate (Köppen Cfb). Racing takes place before peak summer, with frequent rainfall and cool ambient temperatures; night-time temperatures occasionally drop to single digits. Air frosts have not been recorded in June at the Le Mans weather station located a few hundred metres from the pit lane.
The Musée des 24 Heures du Mans, a motorsport museum dedicated to the 24-hour race, is located at the main entrance to the venue.
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