Clearways Lane
109.4 m · net rise 21.6 m · total ascent 24.7 m · overall 19.8% · confidence: needs confirmation · Garelochhead · Argyll and Bute
Shape: sustained — 37% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 88 m.
Found purely from mapping and LiDAR data, and not yet matched against books, race records or lists — it may be well known to locals under a name we've never heard. It was cross-checked against the OS road network, surface models and map tags, but a discovery can still be an artifact of the terrain model or the map. Treat it as a well-evidenced hypothesis until someone has ridden it. If you know this road, tell us what you found — photographs, corrections and local knowledge all welcome; the map links below let you scout it first.
needs review short_window_divergence, unresolved_windows — treat short-window maxima here as provisional.
≈ Overhead cover (tree canopy or structures) spans 65% of this route — detected by comparing the surface model (DSM, treetops and rooftops) against the terrain model (DTM, bare ground). Under cover the bare-ground model is built from fewer laser returns, so metre-scale readings can wobble; maxima whose window sits in a covered zone are marked ≈ below — less certain — the flag does not say whether the true value is higher or lower. Longer windows average over more clean ground and are steadier.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈45% | 61–63 m | under overhead cover terrain reads 97.3% at 95–97 m across a structure — excluded |
| 3 m (diagnostic) | ≈43% | 71–74 m | under overhead cover terrain reads 83.9% at 94–97 m across a structure — excluded |
| 5 m | ≈40% | 71–76 m | under overhead cover terrain reads 58.6% at 92–97 m across a structure — excluded |
| 10 m | ≈32% | 66–76 m | under overhead cover terrain reads 42.5% at 87–97 m across a structure — excluded |
| 20 m | ≈30.3% | 60–80 m | under overhead cover terrain reads 32.0% at 77–97 m across a structure — excluded |
| 25 m | ≈30.3% | 60–85 m | under overhead cover terrain reads 32.6% at 72–97 m across a structure — excluded |
| 50 m | ≈25.2% | 27–77 m | under overhead cover terrain reads 28.6% at 51–101 m across a structure — excluded |
may_continue_beyond_end Extent detection suggests reviewing where this climb starts/ends.
Map
Check this route yourself: Google Maps route via their router · Street View at the base where coverage exists · geojson.io our exact measured line · OpenTopoMap
This climb's data: OCL JSON — the full gradient ladder, quality flags and provenance in the OpenClimb Ladder format.
Ridden it, or know better? Submit data for this climb no account needed
© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap
Profile
Provenance
{
"analysis_version": "0.1.0",
"sample_interval_m": 1.0,
"interpolation": "bilinear",
"smoothing": "none",
"gradient_windows_m": [
5.0,
10.0,
20.0,
25.0,
50.0,
100.0
],
"diagnostic_windows_m": [
2.0,
3.0
],
"elevation_crs": "EPSG:27700",
"elevation_resolution_m": 0.5,
"elevation_tiles": [
"data/cache/scotland/phase-3/dtm/NS29SW.tif"
],
"calculated_at": "2026-08-18T08:21:13+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/scotland-2026-08-14-roads.osm.pbf",
"osm_snapshot": "2026-08-13T20:21:01Z",
"elevation_provider": "Scottish Remote Sensing Portal (AWS Open Data, srsp-open-data)",
"elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Scottish Government, SEPA and partners; Crown copyright",
"elevation_dataset": "Scottish Public Sector LiDAR Phase 3 50cm",
"elevation_tile_ids": [
"NS29SW"
],
"climb_origin": "discovered",
"notes": "Coarse pass: max 18.8% over 200 m (Terrain 50), gain 20.6 m over 109 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%)."
}