SR 109 is not part of the National Highway System, a system of routes important to the nation's economy, mobility and defense. The highway is maintained by the Ohio Department of Transportation (ODOT). ODOT's 2011 annual average daily traffic (AADT) calculations showed that the lowest traffic levels were present on the section between US 6 and SR 110, where only 680 vehicles used the highway daily; the peak traffic volume was 7480 vehicles AADT along a section that is concurrent with US 20A and SR 2.