DMRB: Road Layout CD 116 Version 2.1.0 Geometric design of roundabouts (formerly TD 16/07, TD 50/04, TD 51/17, TD 54/07, TA 23/81, TA 78/97, TA 86/03, TD 70/08). Version 2.1.0

Publication Year

2023

Document Status

Current

Abstract

Provides design requirements for roundabouts, covering types, design features, signal-controlled roundabouts, mini-roundabouts, segregated turns and lanes, subsidiary deflection islands, and designing for pedestrians, cyclists and equestrians.

Document History

Supersedes CD 116 Version 2.1.0 Geometric design of roundabouts (formerly TD 16/07, TD 50/04, TD 51/17, TD 54/07, TA 23/81, TA 78/97, TA 86/03, TD 70/08). Version 2.1.0 (HE, 2023). Road Layout. Design. Supersedes CD 116 Revision 1 Road layout. Design. Geometric design of roundabouts (formerly TD 16/07, TD 50/04, TD 51/17, TD 54/07, TA 23/81, TA 78/97, TA 86/03, TD 70/08). Revision 1 (HE, 2020), and TD 16/07 Road Geometry. Junctions. Geometric design of roundabouts (HA, 2007), TD 51/17 Road Geometry. Highway Features. Segregated left turn lanes and subsidiary deflection islands at roundabouts (HE, 2017), TD 54/07 Road Geometry. Junctions. Design of mini-roundabouts (HA, 2007), and TA 78/97 Road Geometry. Junctions. Design of road markings at roundabouts (HA, 1997), TD 50/04 Road Geometry. Junctions. Geometric layout of signal-controlled junctions and signalised roundabouts (includes correction dated February 2005) (HA, 2004), TA 23/81 Road Geometry. Junctions. Junctions and accesses: determination of size of roundabouts and major/minor junctions (HA, 1988), TA 86/03 Road Geometry. Junctions. Layout of large signal controlled junctions (HA, 2003), and TD 70/08 Road geometry. Links. Design of wide single 2+1 roads (HA, 2008). Design manual for roads and bridges (DMRB). Version 0 dated July 2019. Version 1 dated March 2020 - updates references. Version 2 dated April 2020 - Figure 1.2 updated. Version 2.1.0 dated May 2023 - changes made to Core document, England NAAA, Northern Ireland NAAA, Scotland NAAA and Wales NAAA, with incremental change to requirements.

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