Diagonal Ice Boat Road
What is the recommended width of a diagonal ice boat road, as to not bump into the edges? I am building one which is 5 diagonal ice blocks wide and practicing I am bumping much less into the walls than before, but I am not sure if it's possible to never bump the edges unfortunately, at least it's very hard. I think 7 would be much easier to prevent this problem, but would require a lot of changes to my nether highway.