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 66 (India)

  en.wikipedia.org · Encyclopedia

• Helmets Mandatory for Rider and Pillion: CM

  prudentmedia.in · News report · dated 14 January 2026

• Helmets made mandatory for two-wheeler riders in Goa

  dnaindia.com · News report · dated 21 June 2017

• Notification, Department of Transport, Government of Goa

  goatransport.gov.in · Official page

• Know Vehicle Permit, Department of Transport, Government of Goa

  goatransport.gov.in · Official page

• Govt pulls brakes on those hiring private vehicles

  thegoan.net · News report · dated 20 October 2022

• Bike and Car Renting Laws in Goa

  motoshare.in · Tour company's page · dated 20 February 2025

• Do and Don'ts Advice / Instruction to tourists by Tourism Department

  goatourism.gov.in · Official page

• Uttara Kannada Monsoon Alert: Tourists Risk Lives at Temporary Waterfalls Amid Landslide Warnings

  newsable.asianetnews.com · News report · dated 3 July 2026

• Department of Tourism, Government of Goa

  goatourism.gov.in · Official page

• Karnataka: Death toll in NH 66 landslide reached 6

  newsonair.gov.in · Official page · dated 18 July 2024

• Southwest Monsoon hits Karnataka; red alert in coastal areas

  newsonair.gov.in · Official page · dated 25 May 2025

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

• Entry tax for vehicles from other states: an undated Deccan Herald report (https://www.deccanherald.com/india/karnataka/goa-hikes-entry-tax-for-vehicles-313796.html) lists charges from three-wheelers upward at Goa's border posts. The page could not be opened and no official page was found, so whether two-wheelers pay is not recorded.
• The text of the Goa helmet circular was not found on the Transport Department site; only press reports were read.
• The Goa Transport Department's list of rent a bike notifications could not be opened; only the titles on the main notifications page were read.
• Best months and usual number of riding days: no source found.
• No highest point recorded: this is a coastal route.
• No source found for rules on hire motorcycles or helmets specific to coastal Karnataka.
• The Press Information Bureau release on the 2024 Shirur landslide returned an access error.
• Videos: the pages give upload dates, not filming dates, so 'filmed' is filled only where the title names a date. Uploads, in order: 2025-12, 2022-02.