Route Length Statistics - Ireland

This page hosts statistics of the length in km of the numbered routes currently mapped on OSM.

Important Note: These are very early days for the statistics. The route lengths are based on basic, possibly error-prone, calculations. A number of weaknesses and approximations are inherent in the approach:

• Where route numbers are applied to *_link ways, slip roads, spurs etc., these are included in the length.
• For one-way sections, the length is divided by 2. This is intended to yield reasonable results for dual-carriageways, but will not be accurate in urban one-way systems.
• Due to incorrect tagging, some parts of a numbered route may not be recognised as such. A separate page will be created to track missing ref tags.
• Total lengths of roads of each category having no ref tag present are given in the table. The goal is to reduce these lengths to zero.
• Ways where a ref tag is unnecessary or unreasonable (roundabouts being the obvious example) are not yet ignored. Such ways will for now contribute to the no-ref total length below.
• As these figures are based on an island-of-Ireland planet file, There is the potential for route numbering conflicts on motorways (but not on other road categories). Presently this applies only to the M1, but in the future the M3 will also be a problem.
• The comments field is intended to add day-to-day comments to a particular route's entry. At present, there is no way to preserve such comments when the statistics are updated, so this is best used to document, say, repair work you have performed that will cause a route's statistics to become more reasonable at the time of next generation.