{
  "name": "Thrumshing La Road",
  "slug": "thrumshing-la-road",
  "url": "https://www.bestdrivingroads.com/roads/thrumshing-la-road/",
  "summary": "The Lateral Road over Thrumshing La, at 3,780 m the second-highest pass in Bhutan, falling more than 3,000 m down a wall of cliff-hugging switchbacks from alpine forest into subtropical valleys.",
  "roadNumbers": [
    "NH1"
  ],
  "location": {
    "country": "Bhutan",
    "region": "Bumthang–Mongar",
    "start": {
      "name": "Ura",
      "lat": 27.47762,
      "lon": 90.905439
    },
    "end": {
      "name": "Mongar",
      "lat": 27.264236,
      "lon": 91.285874
    }
  },
  "measurements": {
    "lengthMiles": 91.8,
    "lengthKm": 147.7,
    "driveMinutes": 239,
    "corners": 911,
    "hairpins": 31,
    "maxGradientPercent": 11,
    "summitMetres": 3749.1,
    "elevationConfidence": "approximate (30 m DEM cannot resolve this line)",
    "difficulty": "expert",
    "tightnessOutOf10": 10
  },
  "timing": {
    "bestSeasons": [
      "spring",
      "autumn"
    ]
  },
  "conditions": {},
  "hazards": [
    "Narrow carriageway with sheer unguarded drops",
    "Rockfall and landslides, especially in the monsoon",
    "Road may close in winter due to snow and ice at the pass",
    "Acute altitude effects possible near the 3,780 m summit",
    "Fog and low cloud reduce visibility on the descent"
  ],
  "scenery": [
    "mountain",
    "forest",
    "valley"
  ],
  "pointsOfInterest": [
    "Thrumshing La",
    "Mongar Chorten"
  ],
  "geometry": {
    "pointCount": 1524
  },
  "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": "2026-08-03"
}