Source: https://tendernation.io/opportunities/01a13d0e-023d-703a-aca4-d7c678f63dbc/t0695-diverging-diamond-interchanges-update-to-dmrb-standard-cd-122 awarded GB restricted procedure Suitable for SMEs # T0695 Diverging Diamond Interchanges - update to DMRB standard CD 122 [National Highways](https://tendernation.io/buyers/national-highways) Estimated value £94,497 Published 26 Jun 2025 Deadline Closed 18 Jun 2025 ## Who can bid - Buyer says suitable for SMEs The buyer ticked “suitable for SMEs” on the notice. Anyone can still bid. - Small contract value Valued under £135,018 including VAT, the lowest Procurement Act threshold for goods and services. [More contracts for small businesses and VCSEs](https://tendernation.io/opportunities/for-small-businesses) ## About this tender National Highways (the Client) is seeking the provision of services to undertake research into Diverging Diamond Interchanges (DDI). STAGE 1 SCOPE: Overall, the aims of this task are to: - Measure the safety performance of DDIs to clearly understand how or if they are safer than existing junction types; - Examine potential risks and hazards such as Wrong Way Driving; - Review international standards and determine relevance to UK; and - Review the DMRB to understand how requirements and advice would need to change to encompass Diverging Diamond Interchanges. The award of this work package is initially for Stage 1 only (see background). Subject to further funding, a STAGE 2 FEASIBILITY task would be undertaken in the next financial year: - Identify a location where the layout can be retrofitted and modelled to existing infrastructure such as at an existing dumbbell roundabout at a grade separated junction and then examine scalability across the network; - Investigate how any new risks such as Wrong Way Driving or failure of traffic signals can be reduced or removed; - Measure the environmental and economic benefits such as land take reduction and carbon saving; and - Provide recommendations for requirements, advice and drawings to update the DMRB and update the standards CD 122 and CD 123. This is anticipated to be a report and not an update to the standards in case the findings do not support changing the DMRB. Read full description ## CPV classification Surface water pollution rehabilitation services Source Contracts Finder (UK) [View official notice](https://www.contractsfinder.service.gov.uk/notice/b4c136e0-b340-4d19-a00b-ee1b2e94737e) Never miss a tender like this again Get AI summaries, deadline alerts and a bid pipeline for tenders matched to your business. Free to start. [Track tenders free](https://tendernation.io/register) [Buyer profile National Highways: past awards and live tenders](https://tendernation.io/buyers/national-highways) [Sector More Sewage, refuse, cleaning & environmental tenders](https://tendernation.io/sectors/sewage-refuse-cleaning-environmental) ## More tenders like this [Invitation to Tender Window Cleaning Services - Wirral · Wirral Community Health and Care NHS Foundation Trust · 33 days left · 20 Nov 2026](https://tendernation.io/opportunities/01a1539a-cf1d-702b-9ffd-93cfa91d3c7c/invitation-to-tender-window-cleaning-services-wirral) [Cleaning services – Úklidové služby pro budovy JP · České vysoké učení technické v Praze · 15 days left · 3 Nov 2026](https://tendernation.io/opportunities/01a15183-4b75-72e0-8073-c7b65b5d95d9/czechia-cleaning-services-uklidove-sluzby-pro-budovy-jp) [Refuse and waste related services – Keräyspaperin, tietoturvamateriaalin sekä SER-jätteen poistopalvelun hankinta · Espoon kaupunki · 10 days left · 29 Oct 2026](https://tendernation.io/opportunities/01a15183-11dc-7260-9add-88811d0139f2/finland-refuse-and-waste-related-services-kerayspaperin-tietoturvamateriaal) [Radioactive-, toxic-, medical- and hazardous waste services – Vaarajätepalvelu · Helsingin yliopiston kiinteistöpalvelut Oy · 28 days left · 16 Nov 2026](https://tendernation.io/opportunities/01a15183-2d87-7301-b79a-03b45cbf514a/finland-radioactive-toxic-medical-and-hazardous-waste-services-vaarajat) [Refuse transport services – Odbiór odpadów komunalnych z terenu miasta Maków Mazowiecki · Miasto Maków Mazowiecki · 35 days left · 23 Nov 2026](https://tendernation.io/opportunities/01a15183-3f12-7325-9c2f-18eb44993615/poland-refuse-transport-services-odbior-odpadow-komunalnych-z-terenu-miasta) [Waste-tip management services – Odbiór i zagospodarowanie niesegregowanych (zmieszanych) odpadów komunalnych wraz z selektywną ich zbiórką z terenu Gminy Łowicz w 2027 roku · Gmina Łowicz · 30 days left · 18 Nov 2026](https://tendernation.io/opportunities/01a15183-4a21-72a8-8b90-2d7f33a3108f/poland-waste-tip-management-services-odbior-i-zagospodarowanie-niesegregowan)