# T0695 Diverging Diamond Interchanges - update to DMRB standard CD 122

> Contract award record from UK public-sector procurement sources.

## Key facts

- Public buyer: [National Highways](/buyers/national-highways/contract-awards)
- Contract winner: [WSP UK Limited](/contract-winners/wsp-uk/public-sector-contract-awards)
- Award value: £94,497
- Tender value: £94,497
- Award date: 25 June 2025
- Published: 26 June 2025
- Contract start: 25 June 2025
- Contract end: 31 March 2026
- Stage: awarded
- Procurement category: services
- Notice ID: c72b3a73-f799-4e4e-a9be-322bee88c1ac-851538
- OCID: ocds-b5fd17-b4c136e0-b340-4d19-a00b-ee1b2e94737e

## Description

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: 1\. Measure the safety performance of DDIs to clearly understand how or if they are safer than existing junction types; 2\. Examine potential risks and hazards such as Wrong Way Driving; 3\. Review international standards and determine relevance to UK; and 4\. 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\.

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## Source

[View the original notice on Contracts Finder](https://www.contractsfinder.service.gov.uk/Notice/c72b3a73-f799-4e4e-a9be-322bee88c1ac-851538)