The access shall be constructed to the following
specification
Base Course/Wearing Course
80mm compacted thickness of 28mm nominal size aggregate
dense basecourse macadam to BS4987 1988 (Section Two Clause 6.4).
Surface sealed with bituminous grit brushed into refusal.
Sub Base
225mm compacted thickness granular sub base material,
Department of Transport Specification for Highway Works Clause
803).
The access shall be constructed in such a manner
that no surface water drains directly from the site onto the highway
and if necessary cut-off drains shall be provided. (Gradients should
not exceed 1 in 15).
The access is to be located to offer good
visibility and ideally should extend some 30 metres in each direction
on Unclassified Roads or as otherwise stated by the Planning Consent
for Classified Roads.
The gateway should be set back to allow
provision for a tractor and trailer to wait on the access without
overhanging the highway.
If there is an existing ditch across the
frontage of the property it will be necessary to install a pipe of
suitable diameter to ensure that surface water can continue to flow.
A minimum size of 225mm diameter should be used but my supervisor
should be consulted with regard to invert levels and the possible
need for larger pipes.
Specification for heavy duty
vehicular access
The access shall be constructed to the following
specification
Wearing Course
40mm of 14mm nominal size close graded bituminous macadam
wearing course to B.S. 4987, 1988 (Section two Clause 7.3)
Base Course
60mm of 28mm nominal size dense basecourse macadam to B.S.
4987, 1988 (Section two Clause 6.4).
Sub Base
350mm of granular sub base material Department of Transport
Specification Clause 803, Type 1 (Material to be laid and rolled in
layers not exceeding 200mm thickness)
The access shall be constructed in such a manner
that no surface water drains directly from the site onto the highway
and if necessary cut-off drains shall be provided. It is also advised
that the access is formed so that surface water does not drain from
the highway onto the private driveway (Gradients should not exceed 1
in 15).
Kerbs are required at the junction of the access
with the existing edge of carriageway and they shall be 125mm x 150mm
(Type BN) precast concrete bull-nose kerbs set to show an upstand of
25mm to the road surface channel. Tapered kerbs (Type HB2) will be
required at both ends. Kerbs shall be set on and backed up with 150mm
of class C7.5 concrete.
Precast concrete edging 150mm x 50mm Type EF
should be laid at each side of the access where it crosses the
highway verge bedded on and backed up with ancillary concrete as
above. The same treatment should be used to define the highway
boundary across the driveway particularly where different materials
are being used to form the driveway.
Where the existing footway is formed by precast
concrete or stone paving slabs the vehicular crossing should be
formed in concrete block paving or a 200mm thickness of unreinforced
concrete grade C40 to B.S 5328 Part 2 laid on a separation membrane
on a 200mm thickness of Type 1 granular sub base (DOT Specification)
expansion and contraction joints to be constructed as deemed
necessary.
If there is an existing ditch across the
frontage of the property it will be necessary to install a pipe of
suitable diameter to ensure that surface water can continue to flow.
A minimum size of 225mm diameter should be used but my supervisor
should be consulted with regard to invert levels and the possible
need for larger pipes.
Specification for domestic
vehicular access
The access shall be constructed to the following
specification.
Wearing Course
30mm compacted thickness of 6mm nominal size aggregate
dense wearing course macadam to BS4987, 1988 (Section Two, Clause
7.5).
Base Course
50mm compacted thickness of 20mm nominal size aggregate
dense basecourse macadam to BS4987, 1988 (Section Two, Clause 6.5).
Sub Base
150mm compacted thickness of granular sub base material
(Department of Transport Specification for Highway Works Clause
803).
On weak ground conditions the thickness of sub-base material should
be increased to 300mm.
The access shall be constructed in such a manner
that no surface water drains directly from the site onto the highway
and if necessary cut-off drains shall be provided. It is also advised
that the access is formed so that surface water does not drain from
the highway onto the private driveway (Gradients should not exceed 1
in 15).
Kerbs are required at the junction of the access
with the existing edge of carriageway and they shall be 125mm x 150mm
(Type BN) precast concrete bull-nose kerbs set to show an upstand of
25mm to the road surface channel. Tapered kerbs (Type HB2) will be
required at both ends. Kerbs shall be set on and backed up with 150mm
of class C7.5 concrete. The standard crossing comprises 3 No. dropped
kerbs with tapered kerbs at both ends
Precast concrete edging 150mm x 50mm Type EF
should be laid at each side of the access where it crosses the
highway verge bedded on and backed up with ancillary concrete as
above. The same treatment should be used to define the highway
boundary across the driveway particularly where different materials
are being used to form the driveway.
Where the existing footway is formed by precast
concrete or stone paving slabs the vehicular crossing should be
formed in concrete block paving or a 150mm deep slab of insitu C25
concrete laid on a minimum 150mm of Type 1 sub-base.
If there is an existing ditch across the
frontage of the property it will be necessary to install a pipe of
suitable diameter to ensure that surface water can continue to flow.
A minimum size of 225mm diameter should be used but my supervisor
should be consulted with regard to invert levels and the possible
need for larger pipes.
Where Planning Permission is necessary or has
been granted the layout of the access must conform with the approved
plans.