Increasing speeds were also a concern at the Österreichring; during the final Grand Prix there in 1987 pole-sitter Nelson Piquet's time for the 5.942 km (3.692 mi) of 1:23.357 set an average speed record for the circuit of 159.457 mph (255.756 km/h). At the time it was second only in F1 average speed to Keke Rosberg's 160.9 mph (258.9 km/h) pole lap of the Silverstone Circuit set during the 1985 British Grand Prix. Both times were set using a turbocharged Williams-Honda.