Site Updates

February 2018:

Design Manual for Roads and Bridges

HA 102/17 Spacing of Road Gullies: Incorporating Amendment dated February 2018
HD 217/18 Alternative Filter Media and Surface Stabilisation Techniques for Combined Surface and Sub-Surface Drains
HD 220/18 Vortex Separators for Use with Road Drainage Systems
HD 221/18 Reservoir Pavements for Drainage Attenuation

21st August 2017: IAN 198/17 added to IANs Page.


For more information about pilots and trials on the Highways Agency network or the Guide itself please contact:

Max Brown (

Telephone: ++44 (0) 1173 728541

Highways Agency
Safety, Standards and Research Directorate
Temple Quay House
2 The Square
Temple Quay