Aerial Cable
Flying down the Alcan highway near Haines Junction there is (or was) an aerial tram that stretched from the highway to the top of a nearby mountain some 3000 feet up. My brother will never forget the evasive turn I performed to avoid the almost unseen cable while cruising at 2500 ft agl.
We checked the sectional, "caution aerial tram" in fine print. I thought trams spanned rivers about 100 ft high or so and didn't give it much thought.I do now. (trams are not marked with orange balls)