HIGHWAYS AUTHORITIES' approach to designing streets and local roads is fundamentally flawed and in need of change, transport researchers have told the government.
A new design manual for streets is needed to sit alongside the UK Highways Agency's Design Manual for Roads and Bridges (DMRB) to impose standards on local authorities that would produce streets designed primarily for people and not traffic.
The report builds on a joint research study carried out by TRL, consultant WSP and David Lock Associates into the barriers to development of better quality streets caused by rigid highway design and adoption processes.
It concludes that the lack of a statutory design guide for streets and local roads forces local authorities to fall back on the DMRB, despite it being written for trunk roads and being mainly inter-urban in character.
For minor residential routes designers have access to Design Bulletin 32 (DB32), but the hard engineering criteria there are still rooted in meeting the physical needs of motor vehicles.
Phil Jones, who led the research for consultant WSP, told the ICE annual conference last week that 'both the DMRB and DB32 fail to credit designers with much in the way of engineering judgement.
'Many geometric rules are given without any explanation of their derivation, or the effects on road safety or capacity of deviating from them, ' said Jones.