Going north or going south, this is where the weather changes. You stand 200' above I-49.
Razorback Tunnel, a.k.a. the Bobby Hopper Tunnel or Banyard Tunnel, opened in 1999 to complete the I-49 leg between Fort Smith and Fayetteville, AR, and is the only automobile tunnel in the state of Arkansas. Climbing some 1200' from I-40 near Alma, the tunnel is 1640' above sea level.