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.
• National Highway 13 (India)

  en.wikipedia.org · Encyclopedia · dated 7 August 2025

• Arunachal Pradesh Bike Trip: Mechuka, Anini & Walong Travel Guide

  ourguest.in · Tour company's page · dated 26 November 2025

• Mayodia Pass

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

• Tourist electronic Inner Line Permit: application page

  eilp.arunachal.gov.in · Official page

• Arunachal Pradesh electronic Inner Line Permit portal

  eilp.arunachal.gov.in · Official page

• Advisory, Office of the District Tourism Officer, Tawang

  cdn.s3waas.gov.in · Official page · dated 27 August 2026

• Shi Yomi district: Inner Line Permit

  shiyomi.nic.in · Official page · dated 19 September 2025

• Anini-Roing NH devastated by landslides

  archive.arunachaltimes.in · News report · dated 23 March 2025

• BRO to complete strategically vital road by March 2026: CE

  arunachalobserver.org · News report · dated 29 August 2025

• Arunachal: BRO Restores Tato-Menchuka Road in Shi-Yomi Within 24 Hours After Massive Landslide

  arunachal24.in · News report · dated 4 August 2025

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

• No official source found for any permit beyond the Inner Line Permit for Mechuka, Anini, Walong or Kibithoo; the claim comes from one guide.
• Highway numbers for the Aalo to Mechuka road and the Tezu to Walong road not sourced.
• Highest point is given as Mayodia Pass; a guide mentions a higher army post beyond Mechuka, which is off this route and unverified.
• No official road status page found for Arunachal Pradesh; the Dibang Valley, Anjaw and Shi Yomi district websites carry no road notices.
• A February 2025 washout near Anini is known from a search result only and was not opened.
• No dated source found for road conditions on the Ziro to Daporijo stretch or the Tezu to Walong stretch.
• Whether the Pene to Tato widening met its March 2026 target was not checked.
• Protected Area Permit details for foreign citizens not found on an official page.
• Videos not collected.