Figure 31. I-580/San Francisco Bay Section of proposed Hyperloop route. Table 6. I-580/San Francisco Bay Section data at 300, 555, and 760 mph (480, 890, and 1,120 Criteria kph, respectively). 0.5g Acceleration Min. bend radius at 2.28 miles 300 mph (480 kph) (3.67 km) Min. bend radius at 7.80 miles 555 mph (890 kph) (12.55 km) Min. bend radius at 14.6 miles 760 mph (1,220 kph) (23.5 km) Distance 73.9 miles (119 km) Journey time 626.0 seconds Tunnel distance 3.5 miles (5.6 km) No. of 20 ft (6 m) 2,783 pylons No. of 50 ft (15 m) 775 pylons No. of 100 ft (30 m) 159 pylons Additional length 5.7 miles required (9.2 km)