Spa-Francorchamps is a 7.004-kilometre (4.352-mile) permanent circuit in the Belgian Ardennes, approximately 8 kilometres southeast of the town of Spa. The circuit as it exists today was largely defined by a major 1979 redesign that reduced it from the original 14.100-kilometre public-road triangle. On the current layout, after the long Kemmel Straight, the track runs through Les Combes, Pouhon, Stavelot, and the high-speed Blanchimont sweep before feeding into the Bus Stop and onto the pit straight.
The chicane takes its informal name from its position at the far end of the circuit, near the paddock and pit lane complex. It consists of a tight left-right combination that requires heavy braking from the high approach speeds generated by Blanchimont. A poor exit from the chicane compromises the run onto the pit straight and to the La Source hairpin, making it a tactically significant point for overtaking attempts on the following lap.
The Bus Stop Chicane has been modified on multiple occasions. For the 2004 Belgian Grand Prix — after Spa's return to the Formula One calendar following its absence in 2003 due to tobacco advertising legislation — the final chicane was reprofiled with an additional sweep to the right, altering its character and the line drivers could take through the complex.
A more substantial relocation came with the circuit's 2007 redevelopment. With a new financial backer stepping in after the previous organiser went bankrupt in late 2005, renovation work began on 6 November 2006 and was completed by May 2007 at a cost of around €19 million. As part of this overhaul, the Bus Stop Chicane was moved back towards Blanchimont and the La Source hairpin was shifted forward. These changes created more space for a redesigned pit lane and produced a longer start-finish straight. Formula One returned to the reconfigured Spa for the 2007 Belgian Grand Prix.
The Blanchimont corner that precedes the Bus Stop is a high-speed left-hander present in both the old 14.100-kilometre road circuit and the current layout. It has been the scene of severe accidents over the years. In 2001, Luciano Burti lost his front wing in a clash with Eddie Irvine's Jaguar and left the track at 298 km/h (185 mph), piling into the tyre wall. In 1997, Tom Kristensen had a violent crash in a Formula 3000 car after running wide at the entry to Blanchimont, with the resulting wreckage hitting multiple cars before coming to rest.
The run-off area at Blanchimont is narrower than at other corners taken at comparable speeds, with a 7- to 8-metre drop behind the protective barriers. After Blanchimont, the Bus Stop chicane marks the transition from the fastest section of the circuit to the pit-lane infrastructure zone.
Spa-Francorchamps has held the Formula One Belgian Grand Prix since 1925 and hosted an F1 race in the first-ever championship season at the 1950 Belgian Grand Prix. It has held a Grand Prix every year since 1985 except 2003 and 2006. Beyond Formula One, the circuit hosts the 24 Hours of Spa, the World Endurance Championship 6 Hours of Spa-Francorchamps, and numerous other series across GT, touring car, and single-seater categories.
The circuit is renowned for its unpredictable weather, with conditions capable of varying significantly from one sector to another across its length. The official lap record for the current layout stands at 1:44.701, set by Sergio Pérez in a Red Bull Racing RB20 during the 2024 Belgian Grand Prix, while the unofficial all-time quickest time of 1:40.510 was set by Oscar Piastri in a McLaren MCL39 during sprint qualifying for the 2025 Belgian Grand Prix.