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.
• Transport in Bhutan

  en.wikipedia.org · Encyclopedia · dated 4 May 2026

• Bhutan Travel: frequently asked questions

  bhutan.travel · Official page

• Dochula Pass

  en.wikipedia.org · Encyclopedia · dated 26 September 2026

• Bhutan Travel: visa and permits

  bhutan.travel · Official page

• Guidelines For Indians visiting Bhutan as Tourists

  indembthimphu.gov.in · Official page

• Tourism in Bhutan

  en.wikipedia.org · Encyclopedia · dated 24 September 2026

• Embassy of India, Thimphu: information for Indian nationals entering Bhutan

  indembthimphu.gov.in · Official page

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

• The tourism department and the Indian embassy disagree on whether a route permit is needed for Punakha; not resolved.
• The two sources also differ on travel insurance and on the age band for the half-rate fee (6 to 11 against 6 to 12).
• The Indian embassy's guidelines carry no date; the file name suggests 29 November of an unknown year.
• No Bhutanese transport authority page was found naming the office that inspects vehicles and collects the daily fee at Phuentsholing.
• Whether the daily vehicle fee is waived inside Phuentsholing town was not found.
• Office hours and closed days of the Phuentsholing immigration office not found.
• The immigration portal returned only its title and was not read.
• No dated news source found for landslides or fog on the Phuentsholing to Thimphu road.
• Usual number of days not sourced; highway numbers not sourced.
• Wikipedia names a higher pass at Chapcha on the main road without giving its altitude; Dochula is recorded as the highest sourced point.
• Web search budget ran out before this route; all facts come from pages opened directly.
• Videos not collected.
• Some stretch distances are doubtful. The open map may not know the road riders use, so the routing service went the long way round.