 The northern segment of the highway is maintained by ADOT , who is responsible for maintaining SR 67 like all other highways around the state . As part of this job , ADOT periodically surveys traffic along its routes . These surveys are most often presented in the form of average annual daily traffic , which is the number of vehicles who use the route on any average day during the year . In 2009 , ADOT calculated that around 1 @,@ 100 vehicles used the route daily at its northern terminus in Jacob Lake . The Federal Highway Administration ( <unk> ) lists the highway as a National Scenic Byway , and the National Forest Service has also designated it a National Forest Service Byway . No part of the highway has been listed in the National Highway System , a system of roads in the United States important to the nation 's economy , defense , and mobility . Due to the closure of park facilities on the north rim of the Grand Canyon during winter , winter maintenance is not undertaken after December 1st , with the result that SR 67 is usually closed to <unk> traffic from December 1st until spring . 
