Question: What was the length (to 3 decimals) of the road course at which the 1957 Pescara Grand Prix was held?

full_context: Document 1: Mugello Circuit: Mugello Circuit ("Autodromo Internazionale del Mugello" ) is a race track in Scarperia e San Piero, Tuscany, Italy. Its length is 5.245 km . It has 15 turns and a long straight (1.141 km ). The circuit stadium stands have a capacity of 50,000.
Document 2: 1949 BRDC International Trophy: The first BRDC International Trophy meeting, formally titled the Daily Express International Trophy, was held on 20 August 1949 at the Silverstone Circuit, England. It was the first race meeting to only use the former airfield's perimeter roadways, rather than the main runways. The event was held over two heats of 20 laps and one final of 30 laps of the Grand Prix circuit. The final was won by Italian Alberto Ascari, who would go on to win the World Championship of Drivers twice. In addition to the main Formula One-regulation competition, the meeting also contained events for 500 cc racing cars and production cars. The race meeting was attended by over 100,000 people, but was marred by the death of St. John Horsfall in an accident on the 13th lap of the final race.
Document 3: 2017 Belgian Grand Prix: The 2017 Belgian Grand Prix (formally known as the 2017 Formula 1 Pirelli Belgian Grand Prix) was a Formula One motor race that was held on 27 August 2017 at the Circuit de Spa-Francorchamps in Stavelot, Belgium. The race, scheduled to be contested over forty-four laps, was the twelfth round of the 2017 Formula One season, and marked the seventy-third running of the Belgian Grand Prix and the sixtieth time the race was held at Spa-Francorchamps.
Document 4: Pescara Circuit: The Pescara Circuit was a 16.032 mi road race course near Pescara, Italy. The staggering length was the longest of any open-wheel championship event.
Document 5: 2017 Australian Grand Prix: The 2017 Australian Grand Prix (formally known as the 2017 Formula 1 Rolex Australian Grand Prix) was a Formula One motor race that took place on 26 March 2017 in Melbourne. The race was contested over fifty-seven laps of the Melbourne Grand Prix Circuit and was the first round of the 2017 FIA Formula One World Championship. The race marked the eighty-first race in the combined history of the Australian Grand Prix – which dates back to the 100 Miles Road Race of 1928 – and the twenty-second time the event was held at the Melbourne Grand Prix Circuit. The reigning World Champion Nico Rosberg was the winner of the 2016 race, but he did not defend his win as he retired from the sport after the 2016 season.
Document 6: Mount Panorama Circuit: Mount Panorama Circuit is a motor racing track located in Bathurst, New South Wales, Australia. It is situated on a hill with the dual official names of Mount Panorama and Wahluu and is best known as the home of the Bathurst 1000 motor race held each October, and the Bathurst 12 Hour event held each February. The 6.213 km long track is technically a street circuit, and is a public road, with normal speed restrictions, when no racing events are being run, and there are many residences which can only be accessed from the circuit.
Document 7: 1957 Pescara Grand Prix: The 1957 Pescara Grand Prix was a Formula One motor race, held on 18 August 1957, at the Pescara Circuit near Pescara in Italy. It was race 7 of 8 in the 1957 World Championship of Drivers. The race, which was the only Formula One World Championship race at the track, was held at the longest ever circuit to stage a Formula One World Championship Grand Prix. The track is 25 km/16 miles long and is now part of the SR16bis on the coast of Pescara. It was also the first of the two consecutive Italian races, and after the subsequent race at Monza was complete, it became the first time that two Formula One World Championship races had been held in the same country in the same year.
Document 8: Open Road Racing: Open Road Racing is a form of regularity rally carried out at high speeds on closed public highways, most commonly in sparsely populated parts of the Southwestern United States. Competitors attempt to set specified average speeds which can range from 80 to or higher along courses ranging between 50 and in length. At the lower speeds, unmodified production cars can be used, while straightforward safety modifications can permit powerful sports cars to reach speeds of 165 mph .
Document 9: Italian motorcycle Grand Prix: The Italian motorcycle Grand Prix is a motorcycling event that is part of the Grand Prix motorcycle racing season. From 1949 to 1990 the event was known by the Italian: "Gran Premio Delle Nazioni" ("Nations Grand Prix"). It was one of the original rounds of the Grand Prix motorcycle racing calendar. The race was held exclusively at Monza for the first 23 years of its existence. From 1972 to 1993, the event rotated among several circuits and has been held at the Mugello Circuit since 1994.
Document 10: Guia Circuit: The Guia Circuit, or Circuito da Guia, is a street circuit located at the southeast region of the Macau Peninsula in Macau, China. It is the venue of the prestigious Macau Grand Prix and Guia Race of Macau. The circuit consists of long straights and tight corners, and features the characteristics of a typical street circuit - narrow, bumpy and limited overtaking opportunities. However, there are two special features that can rarely be found in other street circuits - variation in altitude (over 30m between highest and lowest point of the circuit) and an ultra long main straight that allows top speed of 260 km/h on F3 cars. As a result, the circuit is recognised as one of the most challenging circuits in the world in terms of both driving and tuning, as cars have to maintain competitive speed to overcome hill-climbing, twisty corners and long straights in a single lap.
Document 11: 2017 Monaco Grand Prix: The 2017 Monaco Grand Prix (formally known as the Formula 1 Grand Prix de Monaco 2017) was a Formula One motor race held on 28 May 2017 at the Circuit de Monaco, a street circuit that runs through the Principality of Monaco. It was the sixth round of the 2017 season, the seventy-fifth time that the Monaco Grand Prix has been held, and the sixty-fourth time it has been a round of the Formula One World Championship since the inception of the series in .
Document 12: 1987 Austrian Grand Prix: The 1987 Austrian Grand Prix was a Formula One motor race held at Österreichring on 16 August 1987. It was the tenth round of the 1987 Formula One season. It was the twentieth Austrian Grand Prix and the last to be held at the Österreichring for ten years. It was held over 52 laps of the six kilometre circuit for a race distance of 309 kilometres.
Document 13: Coppa Acerbo: The Coppa Acerbo was an automobile race held in Italy, named after Tito Acerbo, the brother of Giacomo Acerbo, a prominent fascist politician. Following Italy's defeat in World War II, and the consequent demise of fascism, the race was renamed the Circuito di Pescara, and in some years was also referred to as the Pescara Grand Prix ("Gran Premio di Pescara"). The race was run between 1924 and 1961 and over the years was held to a variety of vehicle class regulations and durations. In the Pescara Grand Prix formed a round of the Formula One World Championship, a race which still holds the record as having the longest circuit length ever used for a Championship event.
Document 14: 1953 Argentine Grand Prix: The 1953 Argentine Grand Prix was race 1 of 9 in the 1953 World Championship of Drivers, which was run to Formula Two regulations in 1952 and 1953. The race was held in Buenos Aires on January 18, 1953, at the Autódromo Galvez (official name: Autódromo Juan y Óscar Gálvez, also known as the Autódromo 17 de Octubre) as the first official Formula One race in South America. Previously, the Indianapolis 500 (part of the Formula One championship calendar from 1950 to 1960) was the only Formula One championship race held outside of Europe but run to AAA regulations.
Document 15: Formula One drivers from Italy: There have been 98 Formula One drivers from Italy including two World Drivers' Champions. Giuseppe "Nino" Farina won the first ever World Drivers' Championship and Alberto Ascari was the first double world champion. All three championships came in the early 1950s and very few Italian drivers have come close since Ascari's 1953 victory. Four of the most experienced Grand Prix drivers in history come from Italy.
ground_truth: 16.032 mi