A High-quality dual carriageway
(HQDC) is a category of road in the Republic of Ireland
. It is an all-purpose dual carriageway
road type built to near motorway
standards, but without motorway classification or motorway restrictions. High-quality dual carriageways have full grade-separated
access and do not have junctions with minor roads. Such roads in the Republic of Ireland have been built as part of the 2000
to 2013 National Development Plans
, including interurban routes from Dublin to other cities.
While HQDCs or roads of similar type exist in a number of countries (a British example being the A55 road
), this article concentrates mainly on such roads in the Republic of Ireland.
Standard motorways: 52,000 vehicles AADT - annual average daily traffic
. The road type is all-purpose dual carriageway (D2AP), but with the same specifications as motorway: a carriageway
width of 7 metres (23 ft) and a hard shoulder
of 2.5 metres (8 ft 2 in) width. HQDCs are limited access (grade-separated junctions only) and not intended to have junctions with minor roads. Junctions with major roads are grade-separated and to motorway standards.
All HQDCs in Ireland
currently form part of national primary roads
, and therefore use the national road speed limit
of 100 km/h (62 mph). There are exceptions however, as special speed limits may now be specified for sections of road if the local authority
passes a by-law
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