National primary road

National Primary Road

National primary road

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A national primary road () is a road classification in the Republic of Ireland. National primary roads form the major routes between the major urban centres. There are over 2,700km of national primary roads. This category of road has the prefix "N" followed by one or two digits. By contrast, the motorway category has theprefix "M" followed by one or two digits.


The routes numbered N1–N11 radiate anti-clockwise from Dublin, with those in the range N12–N26 being cross-country roads. Routes numbered N27–N31 are much shorter roads than the majority of the network: they link major pieces of infrastructure (such as ports and airports) to the network, while N32 and N33 are feeder routes to major motorways (the M50 and M1 respectively). National secondary roads (see next section) are numbered under the same scheme with higher numbers (from N51 on). On road signage, destinations served but not on the route in question are listed in brackets, with the connecting route also listed (see thumbnail). Directional road signs on national primary roads are usually in white text on a green background, with the road number in yellow. Signs for roads of different standard are shown using appropriately coloured patches according to a system derived from the UK's Guildford Rules.

Most national primary roads are of at least wide two lane standard, with sections within Greater Dublin and near the regional cities typically being at least dual-carriageway...
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