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DfI Roads

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DfI Roads (formerly Transport NI and, before that, the Roads Service of Northern Ireland) is the sole Road Authority in Northern Ireland, responsible for all public roads, as well as for footways, bridges, and street lights. It is part of the Department for Infrastructure (DfI), which was previously known as the Department for Regional Development (DRD).

In the remainder of the UK, trunk roads are the responsibility of the national entities National Highways, Transport Scotland, and the Welsh Government, whilst other roads are looked after by local authorities. In Northern Ireland, however, all public roads are the responsibility of the Department for Infrastructure.

Headquarters

Clarence Court 10 - 18 Adelaide Street Belfast BT2 8GB

Classified unnumbered (Class III) roads

Main Article: Northern Ireland (Class III roads)

For its Class III road network, Northern Ireland uses "C" prefixes.

Junctions

Main Article: DfI Roads (Junctions)

Bridges, Tunnels, and other Crossings

Main Article: DfI Roads (Crossings)



Videos

A1 Junctions Phase 2 Visualisation

2020 visualisation of the proposed route

Watch video > >

Links



DfI Roads
Crossings
Roads
A1 (Northern Ireland) • A2 (Northern Ireland) • A3 (Northern Ireland) • A4 (Northern Ireland) • A5 (Northern Ireland) • A6 (Northern Ireland) • A7 (Northern Ireland) • A8 (Northern Ireland) • A8(M) (Northern Ireland) • A11 (Northern Ireland) • A12 (Northern Ireland) • A20 (Northern Ireland) • A21 (Northern Ireland) • A22 (Northern Ireland) • A23 (Northern Ireland) • A24 (Northern Ireland) • A25 (Northern Ireland) • A26 (Northern Ireland) • A27 (Northern Ireland) • A28 (Northern Ireland) • A29 (Northern Ireland) • A30 (Northern Ireland) • A31 (Northern Ireland) • A32 (Northern Ireland) • A34 (Northern Ireland) • A35 (Northern Ireland) • A36 (Northern Ireland) • A37 (Coleraine - Limavady) • A37 (Cullaville) • A38 (Northern Ireland) • A40 (Northern Ireland) • A42 (Northern Ireland) • A43 (Northern Ireland) • A44 (Northern Ireland) • A45 (Northern Ireland) • A46 (Northern Ireland) • A47 (Northern Ireland) • A48 (Northern Ireland) • A49 (Northern Ireland) • A50 (Northern Ireland) • A51 (Northern Ireland) • A52 (Northern Ireland) • A54 (Northern Ireland) • A55 (Northern Ireland) • A57 (Northern Ireland) • A76 (Northern Ireland) • A99 (Northern Ireland) • A101 (Northern Ireland) • A211 (Northern Ireland) • A371 (Northern Ireland) • A501 (Northern Ireland) • A505 (Northern Ireland) • A509 (Northern Ireland) • A510 (Northern Ireland) • A512 (Northern Ireland) • A513 (Northern Ireland) • A514 (Northern Ireland) • A515 (Northern Ireland) • A519 (Northern Ireland) • A520 (Northern Ireland) • A522 (Northern Ireland) • A523 (Northern Ireland) • B1 (Northern Ireland) • B2 (Northern Ireland) • B3 (Northern Ireland) • B5 (Northern Ireland) • B6 (Northern Ireland) • B7 (Northern Ireland) • B8 (Northern Ireland) • B9 (Northern Ireland) • B12 (Crumlin - Lurgan) • B14 (Northern Ireland) • B15 (Northern Ireland) • B16 (Northern Ireland) • B17 (Northern Ireland) • B18 (Northern Ireland) • B20 (Northern Ireland) • B21 (Northern Ireland) • B23 (Northern Ireland) • B25 (Northern Ireland) • B27 (Northern Ireland) • B28 (Northern Ireland) • B30 (Northern Ireland) • B31 (Northern Ireland) • B32 (Northern Ireland) • B34 (Northern Ireland) • B35 (Northern Ireland) • B36 (Northern Ireland) • B38 (Northern Ireland) • B39 (Northern Ireland) • B40 (Northern Ireland) • B41 (Northern Ireland) • B42 (Northern Ireland) • B43 (Northern Ireland) • B44 (Northern Ireland) • B45 (Northern Ireland) • B46 (Northern Ireland) • B47 (Northern Ireland) • B48 (Northern Ireland) • B49 (Northern Ireland) • B50 (Northern Ireland) • B52 (Belleek - Florencecourt) • B52 (Portglenone - Randalstown) • B53 (Garrison - Rossinver) • B53 (Moorfields - Randalstown) • B56 (Northern Ireland) • B58 (Northern Ireland) • B59 (Northern Ireland) • B62 (Northern Ireland) • B66 (Northern Ireland) • B67 (Northern Ireland) • B68 (Northern Ireland) • B69 (Northern Ireland) • B70 (Northern Ireland) • B73 (Northern Ireland) • B74 (Northern Ireland) • B75 (Northern Ireland) • B76 (Northern Ireland) • B77 (Northern Ireland) • B80 (Northern Ireland) • B81 (Northern Ireland) • B83 (Northern Ireland) • B84 (Northern Ireland) • B85 (Northern Ireland) • B86 (Northern Ireland) • B90 (Northern Ireland) • B92 (Northern Ireland) • B93 (Northern Ireland) • B94 (Northern Ireland) • B95 (Northern Ireland) • B96 (Northern Ireland) • B97 (Northern Ireland) • B98 (Northern Ireland) • B99 (Northern Ireland) • B100 (Northern Ireland) • B102 (Northern Ireland) • B103 (Northern Ireland) • B104 (Northern Ireland) • B105 (Northern Ireland) • B106 (Northern Ireland) • B108 (Northern Ireland) • B114 (Northern Ireland) • B115 (Northern Ireland) • B118 (Northern Ireland) • B119 (Northern Ireland) • B126 (Northern Ireland) • B127 (Northern Ireland) • B135 (Northern Ireland) • B140 (Northern Ireland) • B143 (Northern Ireland) • B145 (Northern Ireland) • B146 (Northern Ireland) • B147 (Northern Ireland) • B148 (Northern Ireland) • B149 (Northern Ireland) • B150 (Northern Ireland) • B154 (Northern Ireland) • B156 (Northern Ireland) • B158 (Northern Ireland) • B161 (Northern Ireland) • B162 (Northern Ireland) • B164 (Northern Ireland) • B165 (Northern Ireland) • B168 (Northern Ireland) • B170 (Northern Ireland) • B172 (Northern Ireland) • B173 (Northern Ireland) • B175 (Northern Ireland) • B176 (Northern Ireland) • B177 (Northern Ireland) • B178 (Northern Ireland) • B180 (Northern Ireland) • B181 (Northern Ireland) • B182 (Northern Ireland) • B183 (Northern Ireland) • B185 (Northern Ireland) • B186 (Northern Ireland) • B188 (Northern Ireland) • B190 (Northern Ireland) • B192 (Northern Ireland) • B193 (Northern Ireland) • B195 (Northern Ireland) • B196 (Northern Ireland) • B197 (Northern Ireland) • B198 (Northern Ireland) • B201 (Northern Ireland) • B202 (Northern Ireland) • B205 (Northern Ireland) • B207 (Northern Ireland) • B210 (Northern Ireland) • B501 (Northern Ireland) • B502 (Northern Ireland) • B503 (Northern Ireland) • B506 (Northern Ireland) • B507 (Northern Ireland) • B511 (Northern Ireland) • B513 (Northern Ireland) • B514 (Northern Ireland) • B515 (Northern Ireland) • B517 (Northern Ireland) • B518 (Northern Ireland) • B520 (Northern Ireland) • B522 (Northern Ireland) • B523 (Northern Ireland) • B524 (Northern Ireland) • B525 (Northern Ireland) • B527 (Northern Ireland) • B528 (Northern Ireland) • B529 (Northern Ireland) • B530 (Northern Ireland) • B532 (Northern Ireland) • B533 (Northern Ireland) • B534 (Northern Ireland) • B535 (Northern Ireland) • B536 (Northern Ireland) • C432 (Northern Ireland) • C437 (Northern Ireland) • C618 (Northern Ireland) • E01 • E16 • E18 • M1 (Northern Ireland) • M2 (Northern Ireland) • M3 (Northern Ireland) • M5 (Northern Ireland) • M12 (Northern Ireland) • M22 (Northern Ireland) • T1 (Northern Ireland) • T2 (Northern Ireland) • T3 (Northern Ireland) • T4 (Northern Ireland) • T5 (Northern Ireland) • T6 (Northern Ireland) • T7 (Northern Ireland) • T8 (Northern Ireland) • T9 (Northern Ireland) • T10 (Northern Ireland) • T11 (Northern Ireland) • T12 (Northern Ireland) • T13 (Northern Ireland) • T14 (Northern Ireland) • T15 (Northern Ireland) • T16 (Northern Ireland) • T17 (Northern Ireland) • T18 (Northern Ireland) • T19 (Northern Ireland) • T20 (Northern Ireland) • T21 (Northern Ireland) • T22 (Northern Ireland) • T23 (Northern Ireland) • Wild Atlantic Way
Places
Miscellaneous
Road Basics
Physical layoutSingle track • Single carriageway • Dual carriageway • High Quality Dual Carriageway • Road Widths • Urban Streets • Abandoned Road
Legal typesAll-purpose Road • Special Road • Motorway • Trunk road • Principal road • Classified Numbered road • Classified Unnumbered Road • Unclassified road • Primary Route • Non Primary Route • Right of Way • Unadopted road
Road numbers1922 Road Lists • Classification • Defunct road • Euroroutes • MoT Maps • National Cycle Network • Numbering principles • Numbering anomalies • Disputed Numbers • Recycled number • Unallocated numbers • Fictional Road Numbers • Junction numbers • Essential Traffic Routes
Road FeaturesArterial Road • Automatic Bollard • Balancing Pond • Belisha Beacon • Bott's Dots • Bypass • Cannon • Cats' Eyes • Cattle Grid • CD Lanes • Central Reservation • Chopsticks • Crash Barrier • Cuttings and Embankments • Cycle Lane • Emergency Phone • Escape lane • Expressway • Fingerpost • Flare • Ford • Gore • Green Bridge • Green Wave • Hairpin bend • Hard shoulder • Island • Junction • Layby • Level Crossing • Local Access Road • Managed Motorways • Milestone • Multi Lane Drop • Multiplex • No-Car Lane • Nose • Oxbow Road • Parapet • Petrol station • Play Street • Raised Pavement Markers • Ramp Metering • Retaining Wall • Road Studs • Roadside Art • Roadside Quarry • Roadworks • Secret motorway • Signage • Smart Motorway • Snow pole • Speed Limit • Spur • Street Lighting • Surface Dressing • Temporary terminus • Throughpass • Tidal Flow • Tiger tail • Toll booth • Traffic cone • Traffic Signals • Tunnel • Vehicle Recovery • Walking and Cycling Friendly Road • Weaving • Wig-Wag Signals • Winter Maintenance • Zip merge
Traffic CalmingBuild-Outs • Chicane • Dragon's Teeth • Home Zone • Low Traffic Neighbourhood • Pinch Point • Quiet Lane • Rumble strips • Safety Cameras • Sleeping Policeman • Speed bump
Public Transport FeaturesBus Lane • Bus stop • Guided Busway • Park and Ride • Tramway • Trolleybus System
Other termsAnderson report • Guildford Rules • Highway Authority • Highway Code • Model Traffic Area • Motorway alphabet • Pre-Worboys • Primary Destinations • Roads by 10 • Transport alphabet • Worboys report
AcronymsAADT • ADS • ANPR • ATM • DfT • GSJ • HA • HATO • HE • HETO • HQDC • LAR • LILO • LTN • MOVA • NCN • NMU • NRA • PBU • POPE • PTS • PFI • RCS • SABRE • SCOOT • SSD • SON • SOX • SRN • TEN-T • TERN • TfL • TII • TOTSO • TRO • TSM • TSRGD • UTC • VAS • VMS • VSL
Roads policy and legislation
Legislation (UK)Road Traffic Act 1930 • Trunk Roads Act 1936 • Trunk Roads Act 1946 • Special Roads Act 1949 • Highways Act 1980 • Roads (Scotland) Act 1984 • Road  Traffic Regulation Act 1984 • Transport (Scotland) Act 2005 • Infrastructure Act 2015 • Transport (Scotland) Act 2019
Legislation (Ireland)Roads Act 1920 • Local Government (Roads and Drainage) Act 1968 • Local Government (Roads and Motorways) Act 1974 • Local Government (Toll Roads) Act 1979 • Roads Act 1993 • Roads (Amendment) Act 1998 • Roads Act 2007 • Local Government (Roads Functions) Act 2007 • Roads Act 2015
PolicyRoads for the Future (1969) • Road Development Plan (Ireland 1979) • Policy Planning and Framework for Roads (Ireland 1985) • Roads For Prosperity (1989) • A New Deal for Trunk Roads in England (1998) • Road Investment Strategy (2014)
Governmental bodiesDepartment for Infrastructure (Roads) • Department for Transport • National Highways • North and Mid Wales Trunk Road Agent • Office of Rail and Road • South Wales Trunk Road Agent • Transport Focus • Transport Infrastructure Ireland • Transport Scotland
Studies and ReportsCairngorm Area - Technical Report 1967 • Routes South of Edinburgh
Other termsProtected Road • Section 278 Agreement • Special Road

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