AMP: 317 Location: SR 90 and Buffalo Soldier Tr, Sierra Vista No reassurance shield after the spurs and the turn. SR 90 might be the worst signed road in the system, especially relative to importance. AMP: 318 Location: SR 90 and 7th St, Sierra Vista 2 miles to SR 92 and the Holiday Inn Express … Continue reading State Route 90, SR 90 Spur/SR 90 Spur to SR 92