Table 5. I-5 Section data at 760 mph (1,120 kph). Criteria 0.5g Acceleration Min. bend radius at 760 14.6 miles mph (1,220 kph) (23.5 km) Distance 227 miles (365 km) Journey time 1,173.0 seconds Tunnel distance 0 miles (0 km) No. of 20 ft (6 m) 10,930 pylons No. of 50 ft (15 m) 1,056 pylons No. of 100 ft (30 m) 0 pylons Additional length 14 miles required (22.5 km) 4.4.1.3. I-580/San Francisco Bay Visualization - The preliminary route is shown in yellow. Bend radii are shown in red. Route - Follows I-580 to minimize land/right of way purchase costs. Deviation from I-580 West of Dublin in order to develop straight sections.