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HD 31/94 Maintenance of Bituminous Roads THE HIGHWAYS AGENCY THE SCOTTISH OFFICE DEVELOPMENT DEPARTMENT THE WELSH OFFICE Y SWYDDFA GYMREIG THE DEPARTMENT OF THE ENVIRONMENT FOR NORTHERN IRELAND DESIGN MANUAL FOR ROADS AND BRIDGES incorporating Amendment No. 2 February 1998 Summary: This amendment revises Chapter 1 "Introduction" and Chapter 2 "Surface Treatments". A paragraph on headrooms has been added to Chapter 1 and Chapter 2 has been amended to include the latest advice on Crack Sealing and information on other surfacing treatments.
