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TRANSCRIPT
8. Temporary Traffic Measures and Signs for Roadworks
CHAPTER 8
November 2010 8/1
Traffic Signs Manual
Chapter 8 Temporary Traffic Measures and Signs for Roadworks
Contents
Page
8.1 Introduction ..................................................................................... 8/3
8.1.1 General ...................................................................................... 8/3
8.1.2 Glossary of Terms and Organisations ....................................... 8/3
8.1.3 Scope ......................................................................................... 8/5
8.1.4 Other Relevant Documents ....................................................... 8/7
8.1.5 Design, Implementation and Removal of Temporary Traffic Measures. .................................................................................. 8/8
8.1.6 Classification of Roads for Roadworks Sites ........................... 8/10
8.2 Equipment for Temporary Traffic Measures ............................... 8/13
8.2.1 Static Signs .............................................................................. 8/13
8.2.2 Size, Positioning and Layout of Signs ..................................... 8/27
8.2.3 Static Sign Supports or Stands ............................................... 8/28
8.2.4 Variable Message Signs .......................................................... 8/29
8.2.5 Delineation Devices ................................................................. 8/31
8.2.6 Lorry Mounted Crash Cushions ............................................... 8/34
8.2.7 Temporary Traffic Control ........................................................ 8/35
8.2.8 Temporary Lighting .................................................................. 8/36
8.3 Static Operations .......................................................................... 8/37
8.3.1 General .................................................................................... 8/37
8.3.2 Design Parameters for the Different Classifications of Roads 8/39
8.3.3 Speed Limits ............................................................................ 8/47
8.3.4 Single Vehicle Operations ....................................................... 8/50
8.3.5 Lane and Hard Shoulder Closures .......................................... 8/51
8.3.6 Road Closures and Detours .................................................... 8/53
8.3.7 Installation and Removal of Temporary Traffic Measures ....... 8/54
8.3.8 Operation and Maintenance of Temporary Traffic Measures .. 8/55
8.3.9 Active Traffic Management ...................................................... 8/56
8.3.10 Night Work ............................................................................... 8/61
8.3.11 Pedestrians and Cyclists ......................................................... 8/62
8.3.12 Work Vehicles and Equipment ................................................ 8/64
8.3.13 Temporary Safety Barriers ...................................................... 8/65
8.4 Semi-Static Lane Closures ........................................................... 8/67
November 2010 8/2
8.5 Mobile Lane Closures ................................................................... 8/69
8.5.1 General .................................................................................... 8/69
8.5.2 Planning a Mobile Lane Closure ............................................. 8/70
8.5.3 Vehicles for Mobile Lane Closures .......................................... 8/72
8.5.4 Signs for Mobile Lane Closures .............................................. 8/74
8.5.5 Design of Mobile Closures....................................................... 8/76
8.5.6 Establishing and Operating a Mobile Lane Closure ................ 8/77
8.5.7 Removing a Mobile Lane Closure ........................................... 8/80
8.5.8 Rolling Road Block (RRB) ....................................................... 8/81
8.6 Crossover Design for Contra-flow Working ................................ 8/83
8.6.1 General .................................................................................... 8/83
8.6.2 Definitions Specific to Crossover Design ................................ 8/83
8.6.3 Traffic Management for Crossovers ........................................ 8/84
8.6.4 Planning a Crossover .............................................................. 8/85
8.6.5 Geometric Design of Crossovers ............................................ 8/87
8.7 AM and PM Tidal Flow Operations ............................................... 8/89
8.8 Signs and Layout Diagrams ......................................................... 8/91
8.8.1 Level 1 Category Roads (Single Carriageway 30km/h) .......... 8/91
8.8.2 Level 2 Category Roads (Single Carriageway 50 or 60km/h) . 8/91
8.8.3 Level 3 and 4 Category Roads (Single Carriageway 80 or 100km/h) .................................................................................. 8/92
8.8.4 Level 5 and 6 Category Roads (Dual Carriageway or Motorway) ................................................................................................. 8/92
8.8.5 Mobile Lane Closures .............................................................. 8/92
8.8.6 AM and PM Tidal Flow Layouts ............................................... 8/93
8.8.7 Layouts for Convoy Working ................................................... 8/94
8.8.8 Layout for Semi-Static Working ............................................... 8/94
Appendix 8A: References ...................................................................... 8/95
Appendix 8B: Summary of Signs for Roadworks: ............................... 8/97
November 2010 8/3
8.1 Introduction
8.1.1 General
8.1.1.1 The Traffic Signs Manual, of which this Chapter forms a part, provides details of the traffic signs which may be used on roads in Ireland, including their layout and symbols, the circumstances in which each sign may be used and rules for positioning them.
8.1.1.2 This Chapter outlines temporary traffic measures to be used at work sites on all public roads to warn, instruct and guide road users in the safe negotiation through or around the work site. It also describes the special signs to be used at roadworks.
8.1.1.3 The objective of this Chapter is to provide any party carrying out construction and maintenance work on a public road with a set of uniform guidelines for the signing and delineation that will promote the safety of both the road user and road worker.
8.1.1.4 The uniform and consistent treatment of similar hazards at roadwork sites by the application of standardised layouts will promote safety by assisting the public in recognising the potential hazards and negotiating safe passage through or around the works.
8.1.1.5 For the purposes of this Manual:
Shall or must indicates that a particular requirement is mandatory;
Should indicates a recommendation; and
May indicates an option.
8.1.1.6 References in this document to chapter numbers indicate references to the other chapters of the Traffic Signs Manual. The other chapters of the Manual are listed in the Preface, and further information on the use of the Manual is given in Chapter 1. References to Section numbers indicate references to other sections of this Chapter.
8.1.2 Glossary of Terms and Organisations
Entities
Contractor Any party undertaking works on or affecting the public road.
Designer Party preparing the design for the temporary traffic measures.
DoEHLG Department of the Environment, Heritage and Local Government.
DoT Department of Transport.
NRA National Roads Authority.
Pedestrians Term includes mobility impaired pedestrians, pushchairs and wheelchair users.
Road Authority Any local authority in charge of the public road.
Documents
BS British Standard.
IS EN European Standard.
NRA DMRB National Roads Authority Design Manual for Roads and Bridges.
NRA TD Standard produced by the NRA, as part of the NRA DMRB, setting out requirements for elements of design for roads.
November 2010 8/4
Terms
Emergency Lane This is a dedicated lane provided for the express use of emergency vehicles only. This lane may form part of the Lateral Safety Zone, if required.
Near-Side Lane This is the left-hand lane on a carriageway with two or more lanes but does not include the hard shoulder if present.
Off-Side Lane This is the right-hand lane on a carriageway with two or more lanes but does not include the hard strip if present.
The terms roadworks and emergency roadworks have the meanings assigned to them in Section 101D of the Road Traffic Act 1961 (as inserted by Section 9 of the Dublin Transport Authority (Dissolution) Act 1987):
roadworks means repairs, maintenance, alterations, improvements or installations or any other works to, above or under, a public road;
emergency roadworks means roadworks, the carrying out of which is immediately required in order to prevent, or reduce the risk of, loss, injury or damage to persons or property.
Safety Zone Longitudinal and Lateral Safety Zones are areas between the works and the cones or barriers adjacent to the running traffic lane. They are required for the safety of the workers.
Set B