{
  "name": "Hirwaun to Beacons Reservoir",
  "slug": "a4059-hirwaun-beacon-reservoir",
  "url": "https://www.bestdrivingroads.com/roads/a4059-hirwaun-beacon-reservoir/",
  "summary": "A driver's favourite that climbs north out of Hirwaun past the Beacons Reservoir, bend after bend under the high peaks of the Brecon Beacons.",
  "roadNumbers": [
    "A4059"
  ],
  "location": {
    "country": "United Kingdom",
    "region": "Wales",
    "start": {
      "name": "Hirwaun",
      "lat": 51.738775,
      "lon": -3.521367
    },
    "end": {
      "name": "Beacons Reservoir",
      "lat": 51.85362,
      "lon": -3.468393
    }
  },
  "measurements": {
    "lengthMiles": 9.6,
    "lengthKm": 15.4,
    "driveMinutes": 19,
    "corners": 26,
    "hairpins": 0,
    "maxGradientPercent": 9,
    "summitMetres": 451.1,
    "elevationConfidence": "measured",
    "difficulty": "moderate",
    "tightnessOutOf10": 5
  },
  "timing": {
    "bestSeasons": [
      "spring",
      "summer",
      "autumn"
    ]
  },
  "conditions": {},
  "hazards": [
    "Sheep on the road",
    "Walkers near the reservoir"
  ],
  "scenery": [
    "mountain",
    "moorland"
  ],
  "pointsOfInterest": [
    "Lamb Hotel",
    "Twyn-Garreg-Wen",
    "Hirwaun Iron Works"
  ],
  "geometry": {
    "pointCount": 70
  },
  "attribution": {
    "source": "Routes - bestdrivingroads.com",
    "citation": "Cite with a link to the road page. Stats are measured from the mapped line, not copied from other lists; where elevationConfidence is \"approximate\" the 30 m DEM cannot resolve that line and the elevation figures are indicative.",
    "roadGeometry": "(c) OpenStreetMap contributors, ODbL",
    "terms": "Facts are free to cite with attribution; bulk reproduction of the catalogue requires permission (simon@keane.studio)."
  },
  "updated": "2026-07-25"
}