The longest straight line you can draw across the Adirondacks without crossing a single road or railroad track, on public land. The white line in each block is that line; the number is its length.
☛ Tap any block for its road-free line, unit, and length.
Each white line is the longest straight segment that crosses no road and no live railroad track, drawn only over public land you're allowed to cross (private inholdings are cut out). Verified against every OSM road, paved and gravel, plus the 84 mi Adirondack Railroad main line from Remsen to Tupper Lake, all with a ~50 m clearance.
The railroad splits what used to be one 34.2 mi block through Five Ponds: the run from Big Moose up through Beaver River, Brandreth and Nehasane to Sabattis is a cleared, graded, actively used corridor, so it cuts the block the same way a road does. North of the tracks the Five Ponds block still runs 27.7 mi; the 84 sq mi south of them is now its own Pigeon Lake block. The Adirondack Rail Trail (Tupper Lake – Lake Placid, rails lifted) is a trail, not a road, so it is not counted here.