T0475 DMRB 2025 review CD 122 Geometric design of grade separated junctions & CD 123 Geometric design of at-grade priority and signal-controlled junctions

National Highways (the Client) is seeking the provision of services to undertake a task to update CD 122 Geometric design of grade separated junctions & CD 123 Geometric design of at-grade priority and signal-controlled junctions. This task to update the standards will ensure the documents comply with the most recent release of the Manual for Development of Documents (MDD). As part of this update there will be opportunity to incorporate previously undertaken research results and available matters arising from the standards. The task will also involve longer term research to feed into future updates.