The Geneva race-track^[1] was established between the lake (Geneva) and the Nations square. Its length was 4.110 km (2.554 mi). Grand-Prix races were organised after World War II, on this track, similar to Formula 1 or Formula 2 races, as well as non championship ones. In total 5 major events happened on this track between 1946 and 1950. Key pilots came here to compete: among them Giuseppe Farina, Raymond Sommer, Maurice Trintignant, Juan Manuel Fangio, Prince Bira (who had established residency, in Geneva).

The closest race-tracks were Aix les Bains – France (Circuit du Lac) and Lausanne (Circuit du Léman or Blécherette). All were temporary urban race-tracks that disappeared shortly after the Le Mans accident in 1955, or before.

Note: contradictory information about the length of the track have been witnessed. Measurement on maps indicate that the shorter length is more likely.

FIA Grand Prix, Circuit des Nations, Geneva, Switzerland – July 21, 1946

44 laps of the urban race track (short version) of 2.965 km (1.842 mi), or 130 km (81 mi), at an average speed of 103.9 km/h (64.6 mph).

FIA Formula 2, non championship race, Circuit des Nations, Geneva, Switzerland – May 2, 1948

70 laps of the urban race-track (short version) 2.945 km (1.830 mi), or 206 km (128 mi), at an average speed of 98.15 km/h (60.99 mph).^[2]

FIA Formula 1, non championship race, Circuit des Nations, Geneva, Switzerland – May 2, 1948

80 laps of the urban race-track (short version) 2,945 m (1.830 mi) or 236 km (147 mi), at an average speed of 98.18 km/h (61.01 mph).

FIA Formula 2, non championship race, Circuit des Nations, Geneva, Switzerland – July 30, 1950

45 laps of the urban race-track 6,325 m (3.930 mi) or 253 km (157 mi), at an average speed of 120.93 km/h (75.14 mph).

FIA Formula 1, non championship race, Circuit des Nations, Geneva, Switzerland – July 30, 1950

68 laps of the urban race-track 6.325 km (3.930 mi) or 430 km (270 mi), at an average speed of 127.60 km/h (79.29 mph).

Towards the end of the third Grand Prix des Nations (1950), the engine of Alberto Ascari's Ferrari 340 blew up, pouring oil onto the corner at the end of the Avenue de la Paix. Behind him Luigi Villoresi, in a Ferrari 275, could not avoid the oil, his car skidded, went over the security barrier and ploughed into the crowd. Three spectators were killed,^[4] another twenty were injured. Villoresi survived with a severely fractured leg.

After this tragedy, stemming like others from the use of street circuits ill-adapted to increasingly high-speed motor racing, the organisers cancelled the following year's event. Geneva would never again host a Grand Prix race.

In 1958 motor racing was banned altogether by the Swiss government as an unsafe spectator sport following the death of 80 people at the 1955 24 Hours of Le Mans race.

• Ultimate Racing History
• 8W Forix.com
• (es) 3ème Grand Prix des Nations 1950