Description
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 standard. There are however some narrow two-lane sections remaining.
Northern Ireland route sections (which are classified separately according to NI schemes) are in some cases included in a theoretical complete cross-border route – for example the N3 route, which re-enters the Republic. These are listed here in brackets for completeness (and are present on southern road signage).
Sections of some national primary roads form part of the European route (E-route) network. Sections of the N25, N11 and N1 roads form the Republic of Ireland part of route E1 (or E01); sections of the N7, N18 and N19 roads form part of route E20; the N8 forms part of route E201 and sections of the N25 form part of route E30. E-route numbers have recently been placed on some route confirmation signs on newer sections of some of these roads.
Read more about this topic: National Primary Road
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