 As a part of these maintenance responsibilities, the department tracks the volume of traffic that uses the roadways under its jurisdiction.These volumes are expressed using a metric called annual average daily traffic, which is a statistical calculation of the average daily number of vehicles on a segment of roadway.MDOT's surveys in 2009 showed that the highest traffic levels along M-216 were the 3,853 vehicles daily in the village of Marcellus; the lowest counts were the 2,421 vehicles immediately east of town.