 Complete the following phrase:  Originally built in 1969 to replace the bland and bumpy Zeltweg Airfield circuit located just across the street, the Österreichring track was situated in the Styrian mountains and it was a visually spectacular and scenic circuit. Although narrow at 10 meters 33 feet in all places, the track was very fast, every corner was a fast sweeper and was taken in no lower than third gear in a five-speed gearbox and fourth in a six-speed gearbox. It had noticeable changes in elevation during the course of a lap, 65 metres from lowest to highest point. Like most fast circuits it was a hard circuit on engines but more difficult on tires, because of the speeds being so consistently high. Many considered the Österreichring to be dangerous, especially the Bosch Kurve, a 180-degree banked downhill right-hand corner with almost no run-off area which, by 