Location: US-16A and SD-244, Pennington Cty Reassurance shield after SD-244 as we head down to Keystone Location: US-16A and Roy St, Keystone About a mile later, we’ll enter the hilariously overbuilt town of Keystone Location: US-16A and Reed St, Keystone We’ll quickly approach the main drag into Keystone, Highway 40. Turn right for SD-40 east … Continue reading U.S. Route 16 Alternate, SD-244 to SD-40