Section 278 agreements – Information required at detail design stage
The level of information we will require will depend, amongst other things, on the scale and location of your proposed works.
The information that we require must be submitted along with any other relevant supportive drawings and information to assess the proposed detailed design. This will enable the efficient consideration of your proposals and hopefully avoid any abortive work at a later stage.
General
- 1:1250 plan showing scheme extents, and existing road network. (An alternative scale may be used to suit nature/size of scheme)
- If not already supplied at a preliminary design stage, provide all information normally required for a preliminary design check
- The design basis e.g. LCC Highway Requirements for Developments or DMRB
Detailed design layouts
1:500 Plans showing:
- Site clearance details
- Drainage layout: Pipe runs, manhole and gully positions. Pipes intended for adoption should be highlighted
- Earthwork details
- Carriageway and footway construction details indicating areas of different pavement types areas of overlay, reconstruction, planing etc.
- Kerbing and edging details
- Traffic sign positions and road markings. Each sign should have an accompanying schedule giving post sizes, mounting heights illumination details, foundation details etc.
- Landscaping proposals
- Road lighting positions
- Fencing proposals showing highway boundary positions and visibility splays
- Safety fence layout
- Structures position and orientation
- Electrical works i.e. trenches and cabling
Vertical design
- Longitudinal sections showing centreline and channels in relation to existing ground levels
- Proposed gradients and k values for sag and crest of curves, horizontal schematic showing curve radii, transitions
- Cross sections showing proposed levels and profile in relation to existing levels and proposed/existing
- Boundaries
Note: Appropriate exaggerated vertical scales should be adopted for longitudinal and cross sections
Junction design
Roundabouts:
- Provide 1:200 or 1:500 plan showing proposed spot levels, contours and crown lines
- Provide design checklist to ensure geometric compliance with DMRB (Vol. 6) – TD 16/93 – Geometric Design of Roundabouts.
- Provide existing, generated & forecast turning flows for the morning and evening peak periods
- Provide traffic reserve capacity calculations for the AM & PM peak periods using the latest version of ARCADY
- Demonstrate deflection
- Show visibility lines
- Provide segregation for cyclists and pedestrians as required
Priority junctions:
- Provide 1:200 or 1:500 plan showing proposed spot levels, contours and crown lines
- Provide design checklist to ensure geometric compliance with DMRB (Vol. 6) – TD 42/95 – Geometric Design of Major/Minor Priority junctions
- Provide design checklist to ensure geometric compliance with DMRB (Vol. 6) – TD 41/95 – Geometric Design of Vehicular Access to All-Purpose Trunk Roads (where appropriate)
- Provide existing, generated & forecast turning flows for the morning and evening peak periods.
- Provide traffic reserve capacity calculations for the AM & PM peak periods using the latest version of PICADY
- Justification for the chosen specific layout
- Provide suitable routes for pedestrians and cyclists as required
Traffic signal junctions:
- Provide a 1:500 or 1:200 plan on a topographical base showing signal heads, pole position, ducting etc.
- Provide existing, generated and forecast turning flows for the morning and evening peak periods.
- Provide appropriate traffic reserve capacity calculations for AM and PM peak periods using LINSIG or TRANSYT (where appropriate)
- Ensure that design complies fully with DMRB (Vol 6) Standard TD 50/99 – The Geometric Layout of Signal Controlled Junctions & Signalised Roundabouts
Pedestrian crossing facility
- Provide a 1:500 or 1:200 plan on a topographical base, showing signal heads, pole position, ducting etc.
- Ensure that design complies with the following standards/advisory notes (as appropriate): -
a) Traffic Advisory Leaflet – 1/02 The Installation of Puffin Pedestrian Crossings
b) Traffic Advisory Leaflet – 04/98 – Toucan Crossing Development
c) Traffic Advisory Leaflet –10/93 – ‘Toucan’ An unsegregated Crossing for
Pedestrians and Cyclists
d) Statutory Instruments – 1997 No.2400- Road Traffic – The Zebra, Pelican and
Puffin Pedestrian Crossings Regulations & General Directions 1997
e) Local Transport Note 2/95 – The Design of Pedestrian Crossings
f) Design Manual for Roads Bridges (DMRB) (Vol 8) – TA 15/81 – Pedestrian
Facilities at Traffic Signal Installations
g) DMRB (Vol 6) – TA 86/03 – Layout at Large Signal Controlled Crossings
h) DMRB (Vol 8) – TD 35/91 – MOVA Traffic Control
i) DMRB (Vol 8) – TA 12/81 – Signals on High Speed Roads
j) DMRB (Vol 8) – TA 16/81 – General Principles of Control by Signals
k) DMRB (Vol 8) – TA 68/96 – Assessment & Design of Pedestrian Crossings
b) Traffic Advisory Leaflet – 04/98 – Toucan Crossing Development
c) Traffic Advisory Leaflet –10/93 – ‘Toucan’ An unsegregated Crossing for
Pedestrians and Cyclists
d) Statutory Instruments – 1997 No.2400- Road Traffic – The Zebra, Pelican and
Puffin Pedestrian Crossings Regulations & General Directions 1997
e) Local Transport Note 2/95 – The Design of Pedestrian Crossings
f) Design Manual for Roads Bridges (DMRB) (Vol 8) – TA 15/81 – Pedestrian
Facilities at Traffic Signal Installations
g) DMRB (Vol 6) – TA 86/03 – Layout at Large Signal Controlled Crossings
h) DMRB (Vol 8) – TD 35/91 – MOVA Traffic Control
i) DMRB (Vol 8) – TA 12/81 – Signals on High Speed Roads
j) DMRB (Vol 8) – TA 16/81 – General Principles of Control by Signals
k) DMRB (Vol 8) – TA 68/96 – Assessment & Design of Pedestrian Crossings
Statutory Undertakers (for example gas, water, cable TV)
- Plans showing existing apparatus along with any diversion/protection proposals.
Structures
Design must comply with agreed Approval in Principle (AIP). All design/check certificates in accordance with BD2/02 shall be supplied to and endorsed by the Technical Approval Authority (in this case the TAA is Leicestershire County Council before construction commences).
The following drawings are required:
General arrangement:
- Detail design – details should include: dimensions, levels, materials and finishes, drainage and service ducts, parapet details, earthwork details, foundation details.
- Reinforcement details showing – cover to steel and reinforcement details in accordance with BS 8666:2000.
Geotechnical Information:
- Initial ground investigation proposals
- Desk study information including preliminary deep borehole work
- Ground investigation including detailed proposals with borehole locations, schedules, long sections and laboratory testing philosophy
- Factual report
- Interpretative report including calculations
- Earthworks design including drawings and specification
- Structural foundation design
‘Buildability’
- Does the design allow for the contractor’s input?
- Provide evidence that construction issues have been addressed in the design, fore example ‘Beany’ blocks constructed to default radii, manholes positioned out of the carriageway
Traffic management
- Are road closures required?
- Provide information for both local and heavy diversion routes (where appropriate)
- Give evidence on the provisions made for local transport services during the construction phase
Drainage design
- Drainage design calculations/output
- Gully spacing design output
- Provide information on the depths of cover of lines
- Provide invert and chamber sizing of access chamber
- Provide discharge calculation at the outfalls
- Provide details of retention storage
- Provide calculations and information on mechanical elements e.g. pumps and throttles
- Provide information on petrol interceptors
Landscaping
- Provide information on planting strategy
- Provide drawing of planting areas
- Provide planting specifications
- Give information on the preparation works and also soil types to be used
- Provide listing of all species of plants and density
- Provide maintenance regime
Construction Design and Management Regulations
- Provide all risk assessment and a copy of the pre-tender health and safety plan
- Provide a copy of F10
Other Supporting Information Required
- Traffic flows
- Carriageway construction design calculation
- CCTV videos of any existing drainage used as outfall/connection
- Sign schedules
- Autotrak plots for HGV manoeuvres at appropriate locations
- Stage 2 safety audit problems, recommendations and designer’s responses where appropriate
- LCC standard drawings: The LCC standard drawings should be used except where no appropriate detail covers the proposal. They are available on the LCC website http://website.leics.gov.uk/standard_drawings.htm. It is not necessary to import the drawings into a consultant's drawing frame, but simply collate them in a binder of booklet.
Page Last Updated: 1 January 2004
