US 20, Gallatin Road
474.8 mi7 hours 55 mins
| Head west on US 89 | 800 feet | |
| Turn right onto North 4th Street (US 30) | 63.6 mi | |
| Take the ramp on the right onto I 15 Business | 0.4 mi | |
| Continue onto I 15 N | 71.3 mi | |
| Take the ramp towards US 20 East: Rigby | 0.3 mi | |
| Turn right onto US 20 | 107.0 mi | |
| Turn left onto Canyon Street (US 191) | 900 feet | |
| Continue onto Gallatin Road (US 191) | 81.5 mi | |
| Turn right onto Huffine Lane (US 191) | 5.3 mi | |
| Continue onto West Main Street (US 191) | 1.7 mi | |
| Turn left onto North 7th Avenue (I 90 Business) | 1.1 mi | |
| Take the ramp on the right | 0.2 mi | |
| Merge left onto I 90 E | 137.7 mi | |
| Take the ramp towards I 90 Business: West Billings | 0.4 mi | |
| Keep left onto I 90 Business | 3.0 mi | |
| Keep left onto Division Street (I 90 Business) | 0.4 mi | |
| Turn right onto 4th Avenue North | 0.5 mi | |
| Turn right onto North 27th Street (MT 3) | 400 feet | |
| You have arrived at your destination |
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Montpelier, Idaho - Billings, Montana