4.4 May 2024 Release
- Refined logic to determine the overall technical difficulty rating of a route: The percentage of a route that can be of higher technical difficulty than given in the ITRS route pie was increased to 5%, but none of the harder trail segments can be longer than 500 m.
- Adaptations and refinements in trail specification of technical difficulty (surface types, maximum grade, average grade, corner radii, terminology for trail width, ). All in a way that previous ratings would not get harder, but in future could in some cases be rated easier.
- Refined definition of water supply ratings within wilderness factor to be more objective
- Updated description of rescue options ratings within wilderness factor to be more objective
- Included dangerous plants under dangerous wildlife within wilderness factor
- Norway and Australia added to the system comparison
- Correction of typos
- Updated endurance level calculator: It now shows how close the route is to the next higher level to support a manual judgment if one should rate the route higher in case, e.g., the climbs are not on a road but on technical trails.
- ITRS-Nutshell: Correction of typos in French version
4.3 March 2024 Release
- Correction of typos and small adaptations
4.2.1 January 2024 Release
- Correction of typos in the full document, biker’s document not affected.
4.2 December 2023 Release (full article here)
- Added a fifth level in the Endurance factor,
- better clarified relationship between Endurance factor and E-Bikes,
- tweaked some values in the ITRS technical difficulty Technical specification of the difficulty levels chart,
- refined the short description of tech levels for bikers & added trail examples,
- added a reading example of the ITRS “route pie”,
- added trail structure terminology page,
- revised endurance formula for the addition of 5th level,
- added clarifications and important comments on exposure ratings,
- added important considerations for rating the wilderness factor,
- introduced a wording to differentiate with in one tech level,
- added page to better explain possible signage archetypes,
- added example of ITRS Implementation in the Lake Garda area in Trentino (Italy) designed by Max2 GmbH,
- updated ITRS Team contacts,
- updated the acknowledgements page,
- correction of typos.
4.1.2 March 2023 Release
- Added color blind feature in pie chart visualisation,
- tweaked some values in the ITRS technical difficulty Technical specification of the difficulty levels chart,
- added translations in French, German & Italian of key ITRS aspects,
- updated the “Goals & guiding principles of the ITRS”,
- correction of typos,
- updated the acknowledgements page.
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3.21 May 2022 Release
This was the first public release of ITRS.