Missouri Secondary State Route A run north-south from Cameron to Lathrop. It goes from BUSN Loop I-35/U.S. Rt. 69, south to Missouri State Route 33/116. MO Sec St Rt A passes through the following towns in Clinton County. Cameron Turney MO Sec St Rt A is multi-plexed in Clinton County. Missouri Secondary State Route H, near Turney. MO Sec St Rt A intersects the following highways in Clinton County. BUSN Loop I-35, at Cameron. U.S. Rt. 69, at Cameron.