I often want to hide the tracks too in order to see what the underlying road looks like or if it even exists in a given mapset.
I tried the transparent option and it did not have the desired effect. It left a whitish thick line with a dark line connecting the very visible track points. I could not see the underlying roads.
I guess I will go back to what I usually do and temporarily delete the track and then restore is via Control-Z.
Maybe I did something wrong with the transparent selection?