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Lower speed limits were applied for heavy motor vehicles without some pneumatic tyres, or used for pulling another vehicle. Road signage was established by the Traffic Signs Regulations, 1956. [2] However, the main piece of legislation responsible for the introduction of speed limits in Ireland was Part IV of the Road Traffic Act, 1961. [3]
On 20 January 2005, imperial speed limits on signs were replaced with metric speed limits. Around 35,000 existing signs were modified or replaced and a further 23,000 new signs were erected bearing the speed limit in kilometres per hour. To avoid confusion with the old signs, all speed limit signs include the symbol "km/h" beneath the numerals. [8]
Speed limits in Northern Ireland are specified in miles per hour. Those in the Republic use kilometres per hour (km/h), a change introduced on 20 January 2005. [1] This involved the provision of 58,000 new metric speed limit signs, replacing and supplementing 35,000 imperial signs.
Regional roads are generally subject to a speed limit of 80 km/h (imperial equivalent 50 mph), rather than the 100 km/h (imperial equivalent 62.5 mph) for national roads. Prior to 20 January 2005, when Ireland adopted metric speed limits, national and regional roads had identical speed limits of 60 mph. Regional roads, however, pass through ...
In 2017, most of all IRTAD countries have a default speed limit in urban roads of 50 km/h, with various lower speeds, for instance, in the Netherlands, 70% of the urban roads are limited to 30 km/h. [3] Some countries, for instance the US, India or China, do not have a specific urban road maximum speed. Different speed limits exist for heavy ...
Distance signs had displayed kilometres since the 1970s but road speed limits were in miles per hour until 20 January 2005, when they were changed to kilometres per hour. [5] Since 2005 all new cars sold in Ireland have speedometers that display only kilometres per hour; odometers generally became metric as well.
In Ireland, the highest category of road is a motorway (mótarbhealach, plural: mótarbhealaí), indicated by the prefix M followed by a one- or two-digit number (the number of the national route of which each motorway forms a part). The motorway network consists entirely of motorway-grade dual carriageways and is largely focused upon Dublin.
National secondary roads have a default speed limit of 100km/h, they fall into the speed limit category of national roads. There are 2657 km of national secondary roads in Ireland, making up slightly over 50% of the entire national route (national primary and national secondary) network. [ 1 ]