Photo of the Month

High Quality Dual Carriageway

From Roader's Digest: The SABRE Wiki

(Redirected from HQDC)
Jump to: navigation, search
High Quality Dual Carriageway
N1 through Ravensdale - Coppermine - 14599.jpg
The N1 is a HQDC
Cameraicon.png Pictures related to High Quality Dual Carriageway
No pictures uploaded (Upload?)
Quick Links
Dual carriageway • Motorway • Expressway

A High Quality Dual Carriageway (HQDC) is a road type in Ireland, although the term is also unofficially applied to similar roads in the United Kingdom.

Irish usage

To fall under this category, a road must (as the name suggests) be an all-purpose road built as a dual carriageway with the vast majority of its junctions being grade-separated, and equipped with hard shoulders. All are part of the National Primary Road network and subject to the standard 100 km/h speed limit, though this may be varied locally. As they are not motorways, all classes of traffic (including cyclists and farm traffic) are allowed onto them.

A large number of HQDCs were upgraded to motorways in 2009, including sections of the N2, N3, N18, and N20.

United Kingdom usage

In the United Kingdom, the term is unofficially used to refer to any road that to the layperson appears to be a "motorway" (and is often colloqually referred to as such), but that has green signage. Such roads may or may not possess hard shoulders. They are usually parts of long-distance routes; examples include the A2 in Kent between the M25 and M2, the A14, and the A42.

The term is occasionally also used to refer to more local sections of routes with grade-separated junctions, such as the A454 Black Country Route between Wolverhampton and Walsall, the A13 past Dagenham, and the A4053 Coventry Inner Ring Road.

The term is also sometimes confused with non-motorway Special Roads.



High Quality Dual Carriageway
Road Basics
Physical layoutSingle track • Single carriageway • Dual carriageway • High Quality Dual Carriageway • Road Widths • Urban Streets
Legal typesAll-purpose Road • Special Road • Motorway • Trunk road • Principal road • Primary Route • Non Primary Route • Right of Way • Unadopted road
Road numbers1922 Road Lists • Classification • Classified Unnumbered Road • Unclassified • Defunct road • Euroroutes • MoT Maps • National Cycle Network • Numbering principles • Numbering anomalies • Recycled number • Unallocated numbers • Fictional Road Numbers • Junction numbers
Other termsAnderson report • A New Deal for Trunk Roads in England • Arterial Road • Automatic Bollard • Balancing Pond • Bus Lane • Bus stop • Bypass • Cannon • Cattle Grid • CD Lanes • Central Reservation • Chopsticks • Crash  Barriers • Cuttings and Embankments • Cycle Lane • Escape lane • Expressway • Fingerpost • Flare • Ford • Green Bridge • Green Wave • Hairpin bend • Hard shoulder • Highway Authority • Island • Layby • Managed Motorways • Motorway alphabet • Multiplex • No-Car Lane • Oxbow Road • Parapet • Park and Ride • Petrol station • Pre-Worboys • Primary Destinations • Ramp Metering • Retaining Wall • Roads by 10 • Roads For Prosperity • Roads for the Future • Road Investment Strategy • Road Studs • Roadside Art • Roadworks • SABRE • Safety Cameras • Secret motorway • Smart Motorway • Snow pole • Speed bump • Speed Limit • Spur • Street Lighting • Surface Dressing • Temporary terminus • Throughpass • Tidal Flow • Tiger tail • Toll booth • Traffic cone • Traffic Signals • Transport alphabet • Tunnel • Weaving • Wig-Wag Signals • Worboys report
AcronymsAADT • ANPR • ATM • DfT • GSJ • HA • HATO • HE • HQDC • LILO • MOVA • NCN • PTS • PFI • SCOOT • SON • SOX • SRN • TEN-T • TERN • TfL • TOTSO • TRO • TSM • TSRGD • UTC • VAS • VMS • VSL