Specification Review

TOPAS undertakes a review of all Specifications on a regular basis. All current reviews are promoted here and Manufacturers, Users and other interested parties are invited to comment on draft specifications as they are produced. (Manufacturers with Product Registrations against specifications which are being reviewed will explicitly be ask to comment during the review process). Please bookmark this page for information regarding reviews

Comments should be forwarded to enquiries@topasgroup.org.uk using the document below

For current specification(s) review:

TOPAS 2543A – Traffic Signal Heads is now in second consultation 5/12/23 – 5/2/24. Please use the consultation template for comments. Previous comments are provided below with Board response.

TOPAS 2514B – Tram Signals is now in first consultation 24/11/23 to 26/2/24. Please use the standard consultation template for comments for any responses

TOPAS 2545A for detection interface protocols is currently being drafted (26/1/22) for further information regarding this process please contact the administrator. However, the draft specification currently has a 3 repositories on a github TOPAS-2545 · GitHub (accessed by this link)

Ended Consultations:

If you require sight of the Board responses to comments received following review and going live please contact the Administrator indicating which specification and version information you require

TOPAS 2546A is live (19/7/23)

TOPAS 2540A is live (3/5/23)

TOPAS 2544A is live (20/4/23)

TOPAS 2510B is live (17/4/23)

TOPAS 2130C is live (7/2/23)

TOPAS 2517C is live (11/7/22)

TOPAS 2541B is now live (20/1/22)

TOPAS 2516D is now live (15/07/21)

TOPAS 2500B is now live (06/07/21)

TOPAS 2505B is now live (28/06/21) and supersedes TOPAS 2504A & TOPAS 2505A

TOPAS 2515C is now live (20/05/21) – no comments received in consultation.

TOPAS 2542A (non contact pedestrian signal demand) is now live (01/03/21).

TOPAS 2520A This specification is now obsolete 26/02/21


Where a product is previously registered against a specification, manufacturers are required to confirm that the product remains compliant with an amended specification using the correct Form from TOPAS 0600 Appendices, in order for the product registered to be migrated on the TOPAS website. Where products are pending registration as a result of review notices, manufacturers are urged to take part in the review process


30th January 2015

The first issues of TOPAS specifications are adapted from the Highways Agency specifications TR25** Series/version that they replace. There are no changes of substance to the specifications, save that all statutory requirements have been removed from Section 1 and a new Appendix Z has been added identifying Technical File Content requirements. Manufacturers must still comply with all statutory requirements and regulations in force as at the date of production and are responsible for ensuring this. Where a TOPAS specification identifies a superseded standard or regulation, this should be read as requiring compliance with the most recent version and not the superseded one.

Any discrepancies existing in the HA specifications taken over by TOPAS will be dealt with at the next round of TOPAS specification Reviews.

This will not affect the status of any HA Type Approvals in existence or presently being requested through the HA.