Mississippi State Route 178 is a east-west highway in Southern Benton County. This is the main surface alternative to U.S. Rt. 78. MS St Rt 178 does not pass through any towns in Benton County. MS St Rt 178 is not multi-plexed in Benton County. MS St Rt 178 intersects the following highways in Benton County. Mississippi State Route 5, near Hickory Flat. Future Interstate 22, near Hickory Flat. U.S. Rt. 78, near Hickory Flat.