 The route is lightly traveled; the busiest section of the road as measured by the Ohio Department of Transportation (ODOT) is within the SR 7 interchange in Bellaire with an AADT of 9,560.The highway now known as SR 149 between Morristown and New Athens has been a part of the State Highway System since 1912; the route was called SR 103 until 1922.By 1923, the Morristown-New Athens route was renumbered to SR 149.