CD 377 - DMRB CD 377 - Requirements for Road Restraint Systems

Oct 24, 2026

Upload by Jiven

Design Manual for Roads and Bridges DMRB CD 377 sets out requirements for permanent and temporary safety barriers and related highway restraint provisions. It specifies minimum containment levels, impact severity level, normalised working width and vehicle intrusion classes, length of need, and siting parameters such as set-back. The manual covers vehicle parapets, terminals, transitions, crash cushions, pedestrian restraint and protection, arrester beds, anti-glare systems, cattle grids, drainage and kerbs, motorcyclist considerations, and passively safe road furniture at multiple infrastructure locations.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages133

Reading Time5 h 35 min

AccessFree to download

Release notes

Foreword

Publishing information

Contractual and legal considerations

Introduction

Background

Assumptions made in the preparation of this document

Mutual Recognition

Abbreviations and symbols

1. Scope

Aspects covered

Implementation and application

Use of GG 101

2. General requirements

Risk assessment and hazard mitigation

Information to be provided and/or specified

3. Requirements for permanent safety barriers

Minimum containment levels

Impact severity level

Normalised working width classes and normalised vehicle intrusion classes

Length of need

Set-back

General requirements

Drainage and kerbs

Passively safe road furniture and equipment, and vehicle restraint systems

4. Requirements for vehicle parapets

Minimum containment levels

Impact severity level

Normalised working width class and normalised vehicle intrusion class

Length of need

Minimum height of parapets

General requirements

Design requirements for parapets and supporting structures

Design Manual for Roads and Bridges Highway Structures & Bridges Design CD 377 Requirements for road restraint systems (formerly TD 19/06) Revision 4 Summary This document details the requirements for permanent and temporary safety barriers, vehicle parapets, terminals, transitions, crash cushions, pedestrian parapets, pedestrian guardrails and pedestrian restraint and protection, vehicle arrester beds, anti-glare systems and cattle grids. Application by Overseeing Organisations Any specific requirements for Overseeing Organisations alternative or supplementary to those given in this document are given in National Application Annexes to this document. Feedback and Enquiries Users of this document are encouraged to raise any enquiries and/or provide feedback on the content and usage of this document to the dedicated Highways England team. The email address for all enquiries and feedback is: [Standards_Enquiries@highwaysengland.co.uk](Standards_Enquiries@highwaysengland.co.uk) This is a controlled document. Contents Release notes 4 Foreword 5 Publishing information ................................................ 5 Contractual and legal considerations ........................................ 5 Introduction 6 Background ...................................................... 6 Assumptions made in the preparation of this document ............................. 6 Mutual Recognition .................................................. 6 Abbreviations and symbols 7 Terms and definitions 8 1. Scope 14 Aspects covered ................................................... 14 Implementation and application ........................................... 14 Use of GG 101 .................................................... 15 2. General requirements 16 Risk assessment and hazard mitigation ...................................... 16 Information to be provided and/or specified .................................... 17 3. Requirements for permanent safety barriers 18 Minimum containment levels ............................................ 18 Impact severity level ................................................. 19 Normalised working width classes and normalised vehicle intrusion classes .................. 19 Length of need .................................................... 19 Set-back ....................................................... 19 General requirements ................................................ 22 Drainage and kerbs .............................................. 24 Motorcyclists .................................................. 24 Other factors .................................................. 24 Passively safe road furniture and equipment, and vehicle restraint systems .................. 25 Safety barrier provision at structural supports ................................... 25 Safety barrier provision at vehicle parapets .................................... 28 Safety barrier provision at gantries ......................................... 29 Vulnerable users ................................................... 29 Safety barrier provision at nosing areas and junctions .............................. 32 Safety barrier provision in central reserves-general ............................... 34 Requirements for gaps in the central reserve ................................... 34 General requirements for an emergency crossing point/maintenance crossing point (ECP/MCP) ... 35 Use of gates at an ECP/MCP ......................................... 35 Use of demountable permanent barrier at an MCP ............................. 35 Additional requirements for "open" ECPs .................................. 36 Additional requirements for maintenance crossing points and maintenance access ........... 38 Winter maintenance crossing points (WMCP) ................................ 38 Other gaps in the central reserve, and provision at start and end poin

FAQs

What types of highway safety restraint systems are specified in CD 377?

CD 377 covers permanent and temporary safety barriers, vehicle parapets, terminals, transitions, crash cushions, pedestrian restraint and protection, arrester beds, anti-glare systems, and cattle grids.

Which technical parameters are required for safety barriers and parapets?

The document specifies minimum containment levels, impact severity levels, normalised working width classes and vehicle intrusion classes, length of need, and siting parameters such as set-back, along with related general requirements.

Where can alternative or supplementary requirements for Overseeing Organisations be found?

Any specific alternative or supplementary requirements for Overseeing Organisations are provided in National Application Annexes to the document.

Oct 24, 2026

Upload by Jiven