U.S. Route 160, SH-3 to SH-3

no photos along this stretch :(. SH-3 parallels 160/550 for a mile and a half or so and then comes back to 160/550 without signage. I have no idea why it’s a state highway. E to US-550, W to US-550 S to US-160, N to US-160 N to US-160/US-550 S to US-160/US-550