Geometric design of grade separated junctions (formerly TD 22/06, TD 39/94, TD 40/94). Version 1.1.1

DMRB: Road Layout CD 122

National Highways, 2022
Geometric design of grade separated junctions (formerly TD 22/06, TD 39/94, TD 40/94). Version 1.1.1 Download document

Document Status

Current

Supplement

Civil & Structural Supplement

Series

DMRB: Road Layout

Abstract

Details requirements for geometric design of grade separated junctions, focussing on the form, merges and diverges, waving and spacing, and connector roads.

History

Road layout. Design. Supersedes CD 122 Geometric design of grade separated junctions (formerly TD 22/06, TD 39/94, TD 40/94). Version 1.1.0 (NHW, 2021). Supersedes: TD 22/06 Road Geometry. Junctions. Layout of grade separated junctions (HA, 2006) TD 39/94 Road Geometry. Junctions. Design of major interchanges (HA, 1994) TD 40/94 Road Geometry. Junctions. Layout of compact grade separated junctions (HA, 1994) Design manual for roads and bridges, DMRB. CD 122 Version 0 - August 2019. CD 122 Version 1 - January 2020: Updates references. CD 122 Version 1.1.0 - November 2021 - changes made to core document, England NAA. CD 122 Version 1.1.1 - January 2022 - changes made to core document, minor editorial changes to correct alignments in Tables 3.21 and 3.32.

Subjects

  • Roads
  • Civil engineering, infrastructure and public utilities
  • Transport facilities
  • Road layout

Publisher History

National Highways is an executive non-departmental public body, sponsored by the Department for Transport. It has responsibility for operating, maintaining and improving motorways and major A roads in England. Formerly known as Highways England, between 2015-2021 and Highways Agency, between 1994-2015.

Information

NBS

NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.

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