Location: Mt Rushmore Rd and Centennial Ave, Custer Reassurance shield as 385 and 89 join US-16 Location: Mt Rushmore Rd and 4th St, Custer A few blocks later, we’ll approach US-16A Location: Mt Rushmore Rd and 4th St, Custer Follow 16 east and 385 north towards Rapid City and Hill City. Follow 16A east and … Continue reading South Dakota Highway 89, US-16 to US-16/US-16A/US-385