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Road safety barrier systems

Published: | Category: Barriers , Maintenance , Specifications | Audiences: Road traffic engineers & consultants, Roading contractors

This specification covers the requirements for road safety barrier systems used on state highways. This 2009 specification is currently under review. For further information, please contact Julian Chisnall at

For further information refer to Technical Advice - road safety hardware.


  1. Notification letters regarding system testing requirements and specification added.

  2. Workshop registration is now available in the road safety barrier training section below.

Publication details

  • Author:
  • Published: October 2009
  • Amendments: Working draft release of M23 Appendix D added on 14 June 2018
  • Also known as: NZTA M23

Road safety barrier systems

Specifications and notes

TitleDate added
M23 Road safety barrier systems - specifications [PDF, 43 KB] Oct 2009
M23 Road safety barrier systems - notes [PDF, 67 KB] Oct 2009
M23 Appendix A: Permanent road safety barrier systems [PDF, 4.5 MB] Jan 2019
M23 Appendix B: Bridge barrier systems (interim) [PDF, 1.1 MB] Sep 2016
M23 Appendix C: Temporary road safety barrier systems [PDF, 2.7 MB] 8 Apr 2019
M23 Appendix D: Specification for slip formed concrete barrier systems (Working draft release) [PDF, 619 KB] June 2018

Interim acceptances for road safety hardware

The following road safety hardware products have been granted interim acceptance pending inclusion in the appropriate NZ Transport Agency specification or guidance documentation (as appropriate).

ProductSupplierTypeExpiry Date
Necklen 80, 100 & 170 series Superhighway Sign Support Systems Necklen Engineering Traffic Sign Supports
(Specification P24)
Kiwisafer™ Culvert End Treatment Saferoads International Drainage n/a
Spigoted Streetlight Column Outreach Steelgal Road Lighting
(Specification M26)

For further information on any of the above products, please contact the National Traffic & Safety Manager.


Temporary Concrete Barrier System Acceptance (2) [PDF, 61 KB] 5 Mar 2015
Temporary Concrete Barrier System Acceptance [PDF, 60 KB] 20 Feb 2015
Temporary barrier connections – Notice of inappropriate practices [PDF, 661 KB] 11 Feb 2014
Colour of wire rope safety barrier posts [PDF, 63 KB] 18 Jul 2013
MASH-1 - Discontinuation of 3-cable wire rope barrier systems [PDF, 63 KB] 31 Oct 2012
MASH-1 - Implementation [PDF, 61 KB] 15 Oct 2012
MASH-1 - Notification of adoption [PDF, 65 KB] 18 Sep 2012
M23 terminal grading plan [PDF, 58 KB] 31 May 2017

Road safety barrier training

Road safety barrier training workshops can be booked online with Conference Brokers(external link).

For more information on these workshops please contact Kim Laurenson.

Road safety barrier systems installation and maintenance inspections workshops 2014 flyer [PDF, 98 KB] May-Nov 2014
Temporary road safety barrier systems workshop 2014 flyer [PDF, 178 KB] 15-16 Apr 2014

Road safety barrier systems course results [PDF, 111 KB]

(Note this list will be updated periodically)

12 March 2018