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] Carriageways 104 Maintenance Resurfacing regimes should be based on an understanding of the existing surface composition and condition of the carriageway. Contractors are encouraged to recycle materials where practicable Innovative surface materials There is continual innovation within the industry of materials science, improving the performance and cost effectiveness of surfacing through more efficient laying techniques and new technologies. While the materials palette is strictly defined on the TLRN to ensure quality and consistency, advances in material technologies will be considered on an ad hoc basis to trial new finishes and test the resilience of the product on a limited stretch of road. Additional information British Standard: BS 594987:2015 Asphalt for roads and other paved areas. Specification for transport, laying, compaction and product-type testing protocols Granite setts for carriageways A sett is a dressed block or stone, 50-300mm in length and 75mm or more in depth. Setts are used to aid the creation of a high quality surface finish to help emphasise greater pedestrian priority. Setts may be considered in exceptional circumstances where looking to: • Provide a high quality low speed environment, for example, for shared space schemes, where vehicle traffic is especially low • Communicate a traffic calmed space with visually related carriageway and footway surfaces • Improve material durability for footway surfaces which are subject to regular vehicle overrun • Reflect the historic character of an area Figure 103: Granite setts used on a carriageway to slow vehicles and create a more pedestrian friendly setting Design considerations The installation of setts should be considered for: • Inset on-carriageway bays and on-footway loading or parking bays and in front of pubs • The flat surface of raised tables on side road entry treatments, but not on the ramp • Footway crossovers • Traffic islands, central median strips or within central reservations that are not flush and do not have regular vehicle overrun Only in exceptional locations where vehicles are known to mount the kerb, can a band of five 100x100mm setts be installed on the footway, running parallel to the kerb. Figure 104: Granite setts on a raised table at Goswell Triangle
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] Carriageways 105 These may be considered where: • The area has special historic or civic significance and requires a high quality surface finish • There is no capacity to provide designated loading bays, but where informal loading is known to take place with a high number of retail units fronting on to the street • Footways are narrow such that installing bollards would overly impinge on footway space • There is insufficient depth to structurally reinforce paving slabs When considering the use of setts it is important to anticipate loading requirements. The specified material and subbase must be designed to withstand expected loading, traffic volume and ground conditions. Where setts terminate and meet tarmac, it is important to specify a robust edge containment detail. Materials Setts should be composed of natural stone: granite or Yorkstone, to match the surrounding footways and complement the character of the built environment. Granite setts are recommended for footways and low speed carriageway settings on side roads or minor roads which do not serve as a bus route. Yorkstone setts are permitted where vehicle overrun is infrequent, such as adjacent to the kerb edge or on footway crossovers. Preferred sizes Generally 200x100mm units are preferred on the TLRN, with depths selected based on the load bearing requirements – please refer to BS7533-12 for further information. Other bespoke dimensions may be permitted upon approval by the SDRG. Herringbone pattern is the preferred way to lay block paving as the interlocking pattern makes it more resilient to turning movements. Maintenance Maintenance of setts is more costly and time consuming than asphalt. Using a mixed palette of colours can help mask dirt, discolouration and marks. Additional information British Standards: BS EN 1341: Provides guidance on the breaking load for setts BS 7533: Part 12 provides sub-structure advice for pedestrian areas
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