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 503 (India)

  en.wikipedia.org · Encyclopedia

• Himachal trip itinerary planner

  himtrails.in · Tour company's page · dated April 2026

• Bir, Himachal Pradesh

  en.wikipedia.org · Encyclopedia

• Green tax in Bir-Billing revised to boost tourism infrastructure

  tribuneindia.com · News report · dated 2 February 2025

• Heavy Vehicles Restricted on Bir Chowk-Landing Site Road

  uniindia.com · News report · dated 21 September 2026

• Himachal toll tax rates revised: Here's what you need to know

  tribuneindia.com · News report · dated 2 April 2026

• Himachal Pradesh revises toll tax rates. Here's how much vehicle entry fee you'll have to pay from April 1

  businesstoday.in · News report · dated 20 February 2026

• Himachal Govt signals rethink on entry tax

  tribuneindia.com · News report · dated 26 March 2026

• Himachal Pradesh Public Works Department

  hppwd.in · Official page

• Roads leading to McLeodganj hill in Dharamsala sinking

  tribuneindia.com · News report · dated 10 February 2025

• Khada Danda road sinks after landslide

  tribuneindia.com · News report · dated 14 August 2025

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

• Himachal entry toll: the two-wheeler exemption rests on a newspaper report of the Chief Minister's statement (26 March 2026). The official Toll Policy 2026-27 document on hptax.gov.in failed to open (certificate error), so it is not confirmed for motorcycles registered in other states.
• Highway number for the Palampur to Baijnath stretch not confirmed; the encyclopedia page for NH 154 lists only its end points.
• Bir Billing green tax: amount, collection point and start date not confirmed on any official page; amount left out.
• No source found for traffic or parking rules in McLeod Ganj.
• The Kangra district page on Bir Billing gives no altitude, season or rules.
• No sourced hazards found for the Bir to Billing road or the Palampur to Baijnath stretch.
• No rider video found for the Bir to Billing road itself. Titles and channels were read from the video pages; motorcycles are not confirmed.