Sources

• Distances, the line of the road and fuel pumps: © OpenStreetMap contributors, Open Database Licence. Routes worked out with the Open Source Routing Machine.
• Heights: NASA Shuttle Radar Topography Mission, public domain, served by Open Topo Data.
• Gurudongmar Lake

  en.wikipedia.org · Encyclopedia · dated 25 July 2026

• Gurudongmar Lake 2026: Status, Permits & Cost Guide

  discoverwithdheeraj.com · Published guide · dated 24 August 2026

• Mangan District: tourist places

  mangan.nic.in · Official page · dated 24 September 2026

• Tourism and Civil Aviation Department: general information

  sikkim.gov.in · Official page

• The NEW Sikkim Permit (2026): Step-by-Step Guide

  bestofnortheast.com · Published guide · dated 3 April 2026

• Sikkim may bar two-wheelers from RAP, PAP areas under proposed permit norms

  indiatodayne.in · News report · dated 19 August 2026

• Sikkim's Lachen-Lachung Route Reopens For Tourists After Three Years

  etvbharat.com · News report · dated 11 September 2026

• Sikkim Bike Permit Rules: What Every Rider Needs to Know Before Hitting North Sikkim in 2026

  northeastindiaconnect.com · Published guide · dated 27 August 2026

• How to self drive a motorbike or car in Sikkim

  darjeeling-tourism.com · Published guide

• Mangan District, Government of Sikkim

  mangan.nic.in · Official page · dated 24 September 2026

• NH-10 reopens after six days of landslide disruption in Sikkim and Kalimpong

  newsonair.gov.in · News report · dated 17 August 2025

• Sikkim begins statewide road inspections to assess monsoon damage

  indiatodayne.in · News report · dated 21 September 2026

A gap is not a fact. It means we looked and found no source.

• No report found of a Cabinet decision on the 19 August 2026 two-wheeler proposal: one web search and the Sikkim front pages of two news sites were checked on 28 September 2026.
• The news report on permits resuming names only 'Friday'; it is dated Friday 11 September 2026, so that date is recorded.
• Blog and news disagree on 2026: the blog records permits resuming on 9 March and stopping around June; the news report says no Lachen permits were issued until September.
• Neither source says whether motorcycles were included when permits resumed in 2026.
• Altitude of Gurudongmar Lake is converted from the district website's 17,800 feet; Wikipedia gives 16,910 feet (5,154 metres) from terrain maps.
• Highway number from Gangtok to Chungthang not sourced.
• No official source for the 150cc minimum, the two-night minimum, or the documents list.
• The vehicle pass portal vehiclepass.sikkim.gov.in could not be opened (certificate error).
• Road status lines on the Mangan district website carry no dates of their own; only the site's last-updated date (24 September 2026) is known.
• No official acclimatisation advisory found for Gurudongmar.
• Fee amounts are not on the official page and are left out.
• Videos not collected.