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.
• Valparai

  en.wikipedia.org · Encyclopedia

• Kodaikanal | Hill Stations in Tamil Nadu | Tamil Nadu…

  tamilnadutourism.tn.gov.in · Official page

• Kodaikanal

  en.wikipedia.org · Encyclopedia

• E-pass mandatory for tourists visiting Kodaikanal, vehicles being checked at…

  dtnext.in · News report · dated 14 November 2024

• Explained: E-Pass System In Nilgiris And Kodaikanal

  outlooktraveller.com · News report · dated 9 October 2024

• Madras HC orders relaxation on e-pass for tourists to Nilgiris…

  dtnext.in · News report · dated 14 March 2025

• Kodaikanal E-Pass 2026: How to Apply for TN Epass Online

  hillscape.pages.dev · Published guide · dated 21 August 2026

• E-pass made mandatory for vehicles entering Valparai

  dtnext.in · News report · dated 1 November 2025

• How to Apply Valparai e-Pass Online 2026 - Simple Steps

  mukundhatoursandtravels.in · Tour company's page · dated 28 May 2026

• Valparai hit by dusk-to-dawn restrictions

  dtnext.in · News report · dated 16 October 2023

• Pollachi To Valparai Route – 40 Hairpin Bends Travel Guide

  valparai.com · Published guide · dated 5 March 2026

• Kolli Hills Ghat Road Kollimalai Top Attractions, Safety Tips, and…

  mandakashayam.com · Published guide

• Case registered against driver of private bus that plunged into…

  pressreader.com · News report · dated 2 May 2024 · seen in search results only

• TN ePass

  epass.tnega.org · Official page

• Coimbatore District, Government of Tamil Nadu | City of Textiles…

  coimbatore.nic.in · Official page

• Dindigul District | Land of Locks and Tannery | India

  dindigul.nic.in · Official page

• Kolli Hills | Namakkal District, Government of Tamilnadu | Land…

  namakkal.nic.in · Official page

• Kolli Hills is the road with 70 hairpin turns

  dangerousroads.org · Published guide

• Yercaud Loop Road Scenic Drive, Safety Tips

  mandakashayam.com · Published guide

• IndianOil locator: Sun Fuels, Venkatesa Mills

  locator.iocl.com · Official page

• IndianOil locator: Baladhandayuthapani Agencies, Palani Bazaar

  locator.iocl.com · Official page

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

• No official page found that says in words whether motorcycles need the Kodaikanal pass; the pass website lists Kodaikanal and Valparai but its form would not load.
• The Dindigul district pages on the Kodaikanal pass and green tax now return an error, so the green tax amount is left out.
• No government order found for the Aliyar check post hours; a newspaper and a local guide give 6 pm, a tour operator gives 10 pm.
• No official source found for Kolli Hills check post timings or any night closure of the ghat road.
• No official source found for an entry fee or toll for two-wheelers at Yercaud, Kolli Hills, Valparai or Kodaikanal.
• The Yercaud speed limit comes from a search summary of a newspaper page that could not be opened.
• The Namakkal district page gives Kolli Hills as 3,940 feet (1,200 metres); the encyclopedia gives 4,270 feet (1,300 metres) for the highest point.
• No source found for the usual number of days riders take, or for fuel on the hill tops.
• Hairpin bend counts are added as header.hairpin_bends, which is not in the schema example; the Valparai and Yercaud counts come from the sources on their hazard entries.
• Both videos cover Kolli Hills; none kept for Valparai, Yercaud or Kodaikanal. Filming dates are not known.