BETA — measurements and names under active refinement. Seen a sign, a gate, or a better name? Report it (photos welcome).

Aston Expressway

747.2 m · gain 32.2 m · overall 4.3% · Ewloe · Sir y Fflint - Flintshire

Shape: sustained — 36% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 12 m.

An unlisted find of this survey, on no list we know of. It was discovered by analysing LiDAR terrain data and cross-checked against the OS road network, surface models and map tags — but despite all that, 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 that someone is you, 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 — treat short-window maxima here as provisional.

Gradient ladder what do windows mean?

Window	Maximum	Located at
2 m (diagnostic)	57.2%	0–2 m
3 m (diagnostic)	55.3%	0–3 m
5 m	37.2%	0–5 m
10 m	21.4%	0–10 m
20 m	13.4%	0–20 m
25 m	11.7%	0–25 m
50 m	8.6%	0–50 m
100 m	7.0%	0–100 m

may_start_earlier 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.

Aston Expressway LiDAR hillshade map with contours

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": 1.0,
  "elevation_tiles": [
    "data/cache/wales/dtm_1m/wg_del_8_329366_20210222dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_8_329367_20210222dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_8_330366_20210222dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_8_330367_20210222dtm.tif"
  ],
  "calculated_at": "2026-08-12T23:12:09+00:00",
  "road_source": "trunk-adopted-routes/aston-expressway.geojson",
  "elevation_provider": "Welsh Government",
  "elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
  "elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
  "elevation_tile_ids": [
    "wg_del_8_329366_20210222dtm.tif",
    "wg_del_8_329367_20210222dtm.tif",
    "wg_del_8_330366_20210222dtm.tif",
    "wg_del_8_330367_20210222dtm.tif"
  ],
  "elevation_capture_dates": [
    "22-02-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 7.8% over 200 m (Terrain 50), gain 22.9 m over 367 m way. EXTENDED by graph walk: +0 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (trunk sweep, Peter's on-sight verdict 2026-08-12): clean table, adopt-all."
}