US 20 $west, Purple Heart Memorial Highway
607.8 mi8 hours 46 mins
| Head south on 5th Avenue | 0.6 mi | |
| Continue onto 15th Avenue | 2.2 mi | |
| Turn right onto 73rd Street (US 30) | 30.0 mi | |
| Continue onto 240th Street (US 30 W) | 41.0 mi | |
| Take the ramp towards I 35 North: Minneapolis | 0.6 mi | |
| Merge left onto I 35 N | 30.5 mi | |
| Take the ramp towards US 20 West: Fort Dodge | 0.3 mi | |
| Merge left onto US 20 W | 145.9 mi | |
| Turn left onto South Virginia Street (US 20 Business) | 300 feet | |
| Take the ramp on the right towards I 29 North | 0.2 mi | |
| Merge left onto I 29 N | 88.0 mi | |
| Take the ramp towards I 90 West: Rapid City | 0.3 mi | |
| Merge left onto Purple Heart Memorial Highway (I 90) | 264.2 mi | |
| Take the ramp towards SD 240: Interior | 0.4 mi | |
| Make a sharp left onto State Highway 240 (SD 240) | 3.6 mi | |
| You have arrived at your destination |
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Keystone, Iowa - Badlands National Park