Kent Design - Technical Appendix - Kent County Council

TABLE 22: CONSTRUCTION THICKNESS - BLOCK
PAVING & SLAB CONSTRUCTION VEHICLE CROSSOVER
Location Residential Vehicle Commercial Vehicle
Crossover
Crossover
Sub-base on formation 150
CBR 2% 250
CBR 3% to 5% 200
CBR >5% 150
Roadbase CBM3/HBM n/a 120
or macadam 50 70
Surfacing: Blocks as for 50mm sand 30mm sand
adjacent carriageway on
or slabs on 25mm sand 25mm sand
3.7.6 SUB-BASE
Footway sub-base shall be Type 1, Type 1G or Type 3 material as
described in Paragraph 3.3. Type1 material should not be used unless
the other materials are not available economically
Where the CBR of the formation is under 3%, i.e. there is a
likelihood of the sub-base being forced into the subgrade during
compaction, a non-woven geotextile separation layer shall be used.
3.7.7 SURFACING - STRUCTURAL LAYER
Footway and Cycleway Roadbase shall comprise one of the following
- subject to the restrictions above:
• Dense basecourse macadam to BS4987, Clause 6.5,
nominal size of coarse aggregate 20mm, binder 100pen,
• Permanent Cold lay base material to Kent County
Council Clause 997AK, nominal size of coarse aggregate
20mm.
• CBM3 to Clause 1035
• Hydraulic Bound materials HBM to Clause 886AK
3.7.8 SURFACING - SURFACE LAYER
Surfacing material shall comprise one of the following - subject to the
restrictions above:
• Close Graded Macadam to BS 4987
• Amenity Surface dressing to the Specification Clause 919
• Slurry Surfacing to the Specification Clause 918
• Concrete block paving to BS 6717. Blocks shall be
rectangular, normally 200mm by 100mm. Secondary
treatment of corners and edges may be permitted if this
is appropriate to the development. They may be 50mm
thick or greater
• Clay Pavers to BS 6677. Pavers shall be rectangular,
normally 200mm by 100mm. They may be 50mm thick
or greater
• Modular type slabs to BS 7263 Part 2
The colour of blocks and if applicable the shape and finish shall be
approved by the Engineer in consultation with the planning officer
and a sample of 0.5m 2 of blocks shall be provided to determine the
consistency of the colour, which shall be consistent throughout the
scheme.
Bituminous Bound materials and surface dressing shall satisfy the
detailed requirements in Table 19. Coloured Bituminous Bound
materials and Slurry Surfacing shall have both the binder pigmented
and the aggregate appropriately coloured. The colour of the material
and if applicable the finish shall be approved by the Engineer in
consultation with the Planning Officer by viewing a sample of the
surface laid elsewhere. The colour shall be consistent throughout the
scheme.
3.7.9 HANDRAILS
Handrails shall be provided on both sides of steps and on footways
and footpaths whenever the gradient exceeds 8%.
Handrails are recommended to be round sections between 45mm
and 50mm in diameter and there should be a gap of 45mm between
the rail and any wall.
Handrails should be set 900mm above a ramp and 850mm above the
nose of a step. The end of any handrail should extend at least 300mm
horizontally beyond the top and bottom of the steps or ramps. There
should be a positive end to the handrail or it shall return into a wall.
3.7.10 PEDESTRIAN GUARDRAILS AND BARRIERS
Pedestrian Guardrails and Barriers shall be provided where ever it is
necessary to protect pedestrians from inadvertently moving into the
carriageway and protect them from traffic. Future guidance can be
sought from the Engineer regarding types of guardrailing especially in
regard to visibility issues.
3.7.11 EMERGENCY ACCESS
Where a footpath is designed to be used as an emergency access for
vehicles it shall be constructed in accordance with the requirements
of tables 20 and 22 for commercial vehicle crossovers.
3.7.12 SIGNING
The signing of footpaths and cycleways shall be in accordance with
Kent County Council’s requirements. Signs shall be located a
minimum of 0.5 meters from the edge of the way.
3.7.13 MARKINGS
Road markings shall be provided on cycleways and footways where
required as described in A Cycling Strategy for Kent.
3.7.14 TRAFFIC REGULATION ORDERS
Traffic Regulation Orders are required for cycleways and may be
required for footpaths, to prohibit use by motor vehicles. The costs
incurred by the Highway Authority in making such orders will be
borne by the Developer.
A G U I D E T O S U S T A I N A B L E D E V E L O P M E N T
Kent
Design
highways specification and construction
57