 The route is maintained by the Colorado Department of Transportation ( CDOT ) , who is responsible for maintaining and constructing transportation infrastructure in Colorado , including highways . As part of this role , CDOT periodically conducts surveys on their highways to measure traffic volume . This is expressed in terms of average annual daily traffic ( AADT ) , which is a measure of the average daily traffic volume on a particular road . In 2009 , CDOT calculated that as few as 3 @,@ 200 vehicles used SH 74 daily near Idledale , and as many as 23 @,@ 000 vehicles used SH 74 near the interchange with I @-@ 70 as well in Evergreen . 
