I am building a map of historic roads with ArcGIS Desktop 10.7.1. Because of the poor accuracy of old maps and the fact that historic roads changed alignment often - sometimes seasonally - a better symbolic representation of such a road is to show a central alignment as a line, but then to show buffer on either side of that central line which together would represents a "corridor". The width of the corridor can vary by road segment depending upon the accuracy [or not] of the source data.
I believe I have seen this done before, but I cannot find a reference to it, probably because I'm using the wrong terminology.