Roads in Hertfordshire: Highway Design Guide

1 3rd Edition Version 1 January 2011 Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Contents 3rd Edition Version 1 January 2011 1 Contents 1. Road Design Criteria Introduction Gateway Features Target Maximum Speed Forward Visibility Carriageway Width Road Curvature Crossfall & Superelevation Gradients Clearances Turning Spaces Industrial , Commercial or Service Roads Road Pavement construction Kerb Upstands Footways Footway / footpath & Cycle Track construction Verges Highway Boundary Markers 2.

2 Junctions Junction Types Junction Spacing (for Simple T-Junctions) Visibility 3. Casualty Reduction and Safety Cameras Casualty Reduction Safety Cameras 4. Road Drainage Surface Water System Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Contents 3rd Edition Version 1 January 2011 2 Sub-Surface Water System 5. Structures Details Technical Approval Information Required as part of Technical Approval Submission Fees, Commuted Sums and Bonds Specification and Design Criteria Supervision of construction 6. Fences Permanent Fencing Temporary Fencing 7. Road Restraint Systems (Vehicle and Pedestrian) Vehicle Restraint Systems (VRS) Pedestrian Restraint Systems 8.

3 Earthworks General Site Investigation and Testing Topsoil Embankments and Cuttings Geosynthetics Ground Improvement Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Contents 3rd Edition Version 1 January 2011 3 9. Vehicle Parking Facilities Provision On Street Parking Dimensions for car-parking spaces and manoeuvring areas Footway parking Motorcycle parking Cycle parking 10. Passenger Transport Facilities General Design Guidance 11. Pedestrian Facilities and Street Furniture General Design Guidance Crossing Points Controlled Crossings Street Furniture 12.

4 Cycling Facilities General Hierarchy of Provision Design Guidance Types of Provision 1st Choice - Traffic Volume Reduction 2nd Choice - Traffic Speed Reduction Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Contents 3rd Edition Version 1 January 2011 4 3rd Choice - Junctions & Traffic Management 4th Choice - Reallocation Of Roadspace 5th Choice - Off Road Cycling Facilities Road Crossings Legal Aspects Miscellaneous Cycle Parking Cycle Mapping 13. Safer Routes to School Introduction Footway Widths Guardrailing Additional Pedestrian Entrances to School Sites Signage and Road Markings School Transport Links and Acknowledgements 14.

5 Traffic Calming and Road Features Introduction Road Humps Rumble Devices and Over-run Areas Over-Run Areas Narrowings Chicanes Gateway and Entry Treatments Mini Roundabouts Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Contents 3rd Edition Version 1 January 2011 5 Continental or Compact Roundabouts Vehicle Activated Devices Traffic Signs, Road Markings and Street Furniture Other Road Features 15. Lighting Detail General Design of Road Lighting for Highways Lighting Levels Glare Control Visual Guidance Equipment Performance Requirements Decisions Prior to Design Brackets Normal Design Procedure Special Design Procedure Private Cable Networks Design Documentation Standard Procedure for New Lighting Installations 16.

6 Traffic Signs and Road Markings Introduction Signing Strategy Existing Signing Types of Signs to be Used Route Destination Planning Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Contents 3rd Edition Version 1 January 2011 6 Continuity of Signing Traffic Sign Detail Design Positioning of Signs Mounting Requirements Foundation Details Post Details Removal of Illuminated Signs Mounting of Signs on Grey Backing Boards Yellow Backing Boards Traffic Signing in Conservation Areas Tourist Signs 14 Temporary Signs Bollard Islands Road Markings and Reflecting Road Studs 17.

7 Traffic Signals General Traffic Signal Design Guidance 18. Intelligent Transport Systems Introduction General Selective Vehicle Detection (SVD) / Bus Priority Automatic Vehicle Location (AVL) / Bus Priority Access Control Vehicle Actuated Sign (VAS) & Variable Message Sign (VMS) Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Contents 3rd Edition Version 1 January 2011 7 Close Circuit Television (CCTV) Passenger Transport Information Systems 19. Traffic Regulation Orders Detail Introduction What are the types of TRO/ SLO What is the TRO s/ SLO s process Procedures for PTRO s, ETRO s, TTRO s and SLO s Road Humps / Pedestrian Crossings When PTRO s are required When TTRO s are required Additional information on other relevant Orders 20.

8 Landscape Soft Landscaping Hard Landscaping 3rd Edition Version 1 January 2011 Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 - Design Standards and Advice Chapter 1 Road Design Criteria Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Chapter 1 Road Design Criteria 3rd Edition Version 1 January 2011 1 1. Road Design Criteria Introduction .. 2 Gateway Features .. 2 Target Maximum Speed .. 2 Forward Visibility .. 4 Carriageway Width .. 4 Road Curvature .. 4 Horizontal Curvature .. 4 Reverse Curves .. 5 Transition Curves.

9 5 Vertical Curvature .. 5 Crossfall & Superelevation .. 5 Gradients .. 5 Clearances .. 5 Turning Spaces .. 6 Industrial , Commercial or Service Roads .. 6 Road Pavement construction .. 7 Formation .. 7 Capping .. 7 Sub-base .. 7 Bituminous Layers & Block Paving .. 8 Kerb 10 Footways .. 10 Footway / footpath & Cycle Track construction .. 12 Bituminous construction .. 12 Block Paved construction .. 12 Flag Paving and Other Materials .. 12 Verges .. 12 Highway Boundary Markers .. 13 Roads in Hertfordshire: Highway Design Guide 3rd Edition Section 4 Design Standards and Advice Chapter 1 Road Design Criteria 3rd Edition Version 1 January 2011 2 Introduction For general guidance on the layout and Design considerations of Roads , reference should be made to the Design Manual for Roads & Bridges (DMRB) and Manual for Streets (MfS).

10 Section 2, Chapter 8: Road Hierarchy details the expected Design characteristics for different categories of road. HCC requires the use of two different approaches to Highway Design depending on the character and function of the road. The first is the standards based traditional Design approach based on the Design Manual for Roads and Bridges. This is for use on Roads where the primary function is conveyance of through-traffic or the movement function of the road. The second is context-based MfS approach where the aim is to build a sense of community or to prioritise the movement of vulnerable road users such as pedestrians above the private motor vehicle or in other words, prioritise the place function of the street.