STREETSCAPE GUIDANCE

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HOME INTRODUCTION PART A A vision for London’s streets PART B From strategy to delivery PART C New measures for new challenges PART D Balancing priorities PART F Appendix PART E Physical design and materials SECTION 6 Introduction SECTION 7 High quality footways SECTION 8 Carriageways SECTION 9 Crossings SECTION 10 Kerbside activity SECTION 11 Footway amenities SECTION 12 Safety and functionality SECTION 13 Street environment SECTION 14 Transport interchanges Streetscape Guidance [Part E – Physical design and materials] Crossings 172 9.9 Road bridges This section details streetscape design considerations for bridges which support motor vehicle traffic. In most inner city areas, bridges will also provide access for pedestrians on the footway (for pedestrian and cycle bridge design guidance, see ‘Pedestrian and cycle bridges’). Figure 173: Tower Bridge is an international symbol of London From a streetscape perspective, bridges are an extension of the street environment and should be considered a cohesive and integral part of the road network. Bridges differ from a standard street arrangement in that there will typically be no active frontages or intersecting side roads. Most bridges can therefore be considered a linear self-contained link; one where vehicles and pedestrians only enter from either end. For this reason it is important to ensure that a consistent approach is adopted across any bridge structure, in layout and materiality. Design considerations • Bridge alignments should be selected to minimise the use of retaining structures, while making the crossing as square as practicable to the existing road geometry • Footways, cycleways and road widths should be maintained across the full length of the bridge where practicable, with regular kerb alignments. Any change in alignment should consider the potential impact on cyclists • A preferred minimum footway width of 2,000mm should be provided on both sides of the carriageway • The needs of cyclists and other nonmotorised vehicle traffic must be fully considered in any bridge design • Street furniture on the bridge itself should be kept to a minimum to maximise footway capacity • Parking bays should not be implemented within the bridge structure or on the approach • For bridges located close to non-signalised junctions, any associated infrastructure such as guardrails should be positioned so as not to reduce visibility for motorists and pedestrians • Designers should look to minimise the use of guardrails on bridges and only consider where there is a proven safety issue • At-grade pedestrian crossings should be provided within close proximity to either end of the bridge structure • Utility cabinets and access arrangements may become clustered at either end of the bridge. Design teams should look to ensure that the approach remains as unobstructed and free from clutter as possible • All bridges in visually important locations shall be given appropriate aesthetic design considerations. This may include artwork and bespoke design treatments, upon approval by the SDRG • Designers should consider all sides of the bridge aesthetics, particularly the underside and how it relates to other roads and the surrounding architecture
HOME INTRODUCTION PART A A vision for London’s streets PART B From strategy to delivery PART C New measures for new challenges PART D Balancing priorities PART F Appendix PART E Physical design and materials SECTION 6 Introduction SECTION 7 High quality footways SECTION 8 Carriageways SECTION 9 Crossings SECTION 10 Kerbside activity SECTION 11 Footway amenities SECTION 12 Safety and functionality SECTION 13 Street environment SECTION 14 Transport interchanges Streetscape Guidance Materials • The bridge streetscape should be designed to provide a seamless transition from the surrounding street environment • Surface paving should continue as it is found on the approach to the bridge structure. Paving units may require a consistent cut across the full length of the footway should a change in gradient be required • Expansion joints should be carefully detailed with respect to any adjoining paving materials • Trees on bridges should generally be avoided. Consult the Arboriculture and Landscape team for further information • Lighting should be carefully considered so as to provide a symmetry and quality that enhances the architecture of the bridge structure. In exceptional circumstances, lighting may be incorporated within the bridge structure itself • Signage should be used on the approach to the bridge but should be avoided on the bridge • Acoustic protection for adjacent land uses may be required • Materials for the actual bridge structure are to be selected on a basis of maximising durability, while minimising maintenance requirements • Timber is only acceptable for use as cladding in exceptional circumstances, where the bridge has a significant role for pedestrians Additional information Department for Transport, Highways Agency: Design Manual for Roads and Bridges, Volume 2 – Highway Structures: Design (Substructures and Special Substructures), Materials Transport for London: London Cycling Design Standards (2014) [Part E – Physical design and materials] Crossings 173
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STREETSCAPE GUIDANCE

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