{
  "name": "Passo del Mortirolo",
  "slug": "passo-del-mortirolo",
  "url": "https://www.bestdrivingroads.com/roads/passo-del-mortirolo/",
  "summary": "Cycling's most feared climb, brutally steep and narrow.",
  "roadNumbers": [
    "SP81"
  ],
  "location": {
    "country": "Italy",
    "region": "Lombardy",
    "start": {
      "name": "Mazzo di Valtellina",
      "lat": 46.255305,
      "lon": 10.2648
    },
    "end": {
      "name": "Monno",
      "lat": 46.216948,
      "lon": 10.342964
    }
  },
  "measurements": {
    "lengthMiles": 10.1,
    "lengthKm": 16.3,
    "driveMinutes": 23,
    "corners": 40,
    "hairpins": 12,
    "maxGradientPercent": 18,
    "summitMetres": 1858.4,
    "elevationConfidence": "measured",
    "difficulty": "expert",
    "tightnessOutOf10": 8
  },
  "timing": {
    "bestSeasons": [
      "summer",
      "autumn"
    ]
  },
  "conditions": {},
  "hazards": [
    "Extreme gradient and tight bends",
    "Cyclists in numbers",
    "Narrow, blind corners"
  ],
  "scenery": [
    "mountain",
    "forest"
  ],
  "pointsOfInterest": [
    "Passo della Foppa",
    "Lapide ai Caduti",
    "memorial Marco Pantani"
  ],
  "geometry": {
    "pointCount": 198
  },
  "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"
}