Chapter 8 Traffic Signs Manual
Chapter 8 Traffic Signs Manual is a comprehensive guide that sets out the standards and regulations for the design, planning, operation, and management of temporary traffic management (TTM) on roads in the UK. It is primarily aimed at ensuring the safety of road users and workers while maintaining efficient traffic flow during roadworks and other temporary disruptions.
Chapter 8 is divided into two main parts:
- Part 1: Design
- Part 2: Operations
Below is a detailed breakdown of the contents, with technical explanations and practical applications.
Part 1: Design
Chapter 8 Part 1 focuses on the design principles for temporary traffic management layouts, ensuring they meet safety, visibility, and operational requirements.
Introduction
This section explains the objectives of Chapter 8: primarily to ensure the safety of road users and workers and to minimise disruptions caused by roadworks. It stresses the need for proper planning and adherence to legal and safety requirements.
Legal Framework
TTM designers and managers must ensure that schemes comply with these regulations and that traffic flow and worker safety are prioritised.
Risk Assessment
All temporary traffic management schemes must begin with a thorough risk assessment to identify potential hazards to road users and workers. The risk assessment must take into account:
- Traffic speed and volume
- The type of road (motorway, dual carriageway, or local road)
- Pedestrian access
- Worksite activities and their potential to disrupt traffic
This is crucial for determining what type of traffic management system is needed, such as lane closures, diversions, speed reductions, or temporary traffic lights.
Temporary Traffic Management Design Principles
This section outlines the principles behind effective traffic management design:
- Traffic Safety Measures: Signage, barriers, cones, and other measures must be placed to clearly direct traffic and protect workers. This includes the use of advance warning signs and safe entry and exit points for worksites.
- Visibility: Traffic signs and signals should be positioned to maximise visibility. Signage must meet minimum height and lateral placement standards for both day and night conditions. The visibility of workers through the use of high-visibility clothing is also crucial.
- Traffic Flow: Where possible, traffic flow must be maintained. Lane widths should not be reduced excessively, and alternative routes should be provided in the event of full road closures.
- Environmental Considerations: The design should also consider noise, dust, and emissions, particularly in residential or environmentally sensitive areas.
Signage and Road Markings
Chapter 8 requires that all temporary signage comply with the requirements set out in the Traffic Signs Regulations and General Directions (TSRGD). This includes:
- Types of Signs: Different shaped signs are specified for road closures, lane changes, and speed restrictions. They must be clear, easily understood, and reflective for visibility during night-time or low-light conditions.
- Advance Warning Signs: These should be placed well in advance of the work area to allow drivers to safely reduce speed and make necessary lane changes.
- Temporary Road Markings: If lanes are temporarily realigned or traffic is diverted, road markings should clearly indicate the new traffic patterns.
Lane Closure Requirements
When closing lanes for roadworks, the layout and signage must be tailored to the type of road:
- Motorways: Lane closures on motorways require careful consideration due to high-speed traffic. Advance warning signs and tapers (conical patterns that gradually guide vehicles away from closed lanes) must be implemented.
- Dual Carriageways and Single Carriageways: Specific guidance on how to implement lane closures, including minimum lane widths and buffer zones, is provided to maintain the safety of road users and workers.
- Urban Areas: Where traffic congestion is more likely, lane closures must be accompanied by alternative routes or one-way systems.
Pedestrian and Cyclist Considerations
If roadworks interfere with pedestrian walkways or cycling lanes, Chapter 8 provides guidance on ensuring their safe passage:
- Pedestrian Routes: Safe, clear, and accessible pedestrian routes must be maintained at all times, with pedestrian ramps or alternative paths provided where necessary.
- Cyclist Routes: If cycle paths are affected, either clear alternative routes should be provided, or temporary cycle paths should be created.
Part 2: Operations
Chapter 8 Part 2 covers the operational aspects of temporary traffic management, such as the procedures for setting up, operating, and dismantling TTM systems.
Site Setup
Before roadworks commence, the following operational procedures should be followed:
- Site Survey: Conduct a thorough site survey to assess traffic conditions, available space for traffic management equipment, and potential hazards.
- Traffic Diversions: Implement diversion routes if required, ensuring they are clearly signposted and able to handle the diverted traffic volume.
- Workforce Safety: Workers must be fully briefed on site safety, including the use of Personal Protective Equipment (PPE), proper signalling, and site access protocols.
- Vehicle Movements: A plan for site vehicles entering and leaving the work zone must be established to minimise disruptions and hazards.
Traffic Control Techniques
This section outlines the various traffic control techniques used during roadworks:
- Stop/Go Boards: Used in low-speed areas to control traffic alternately through single-lane roadworks.
- Traffic Signals: Temporary traffic signals are needed for larger sites where traffic control personnel are insufficient.
- Priority Working: This involves giving one direction of traffic priority while the other direction waits. This is used where there is limited space for two-way traffic.
- Lane Tapers: These are conical patterns or markings that gradually guide vehicles from open lanes to closed lanes. Tapers must be set at appropriate lengths depending on road speeds.
Buffer Zones and Safety Zones
- Buffer zones are essential to protect workers and should always be maintained between live traffic lanes and the work zone. These zones serve as a safe area for workers if traffic encroaches on the site. The size of the buffer zone varies depending on road speed and the type of work being carried out.
- Safety zones must be cordoned off using cones, barriers and signs, and must remain free of debris or equipment to allow workers to safely navigate the site.
Installing, Maintaining, and Removing Traffic Management
The installation, maintenance, and removal of TTM systems must be conducted in a way that minimises risks and delays:
- Installation: Traffic management equipment must be set up outside peak traffic hours where possible to avoid congestion.
- Maintenance: All TTM systems must be regularly inspected to ensure that signs, cones, and barriers remain in place, particularly after adverse weather conditions.
- Removal: Once roadworks are completed, TTM equipment must be dismantled quickly and safely, restoring the road to its original condition without delay.
Health and Safety Protocols
Worker safety is a core focus of Part 2:
- Personal Protective Equipment (PPE): All workers must wear high-visibility clothing, helmets, and safety boots. PPE must be regularly inspected for wear and tear.
- Safe Working Practices: Workers should adhere to safe working distances, use proper lifting techniques, and be aware of moving vehicles and machinery on-site.
- Training: Workers must be trained in traffic management, vehicle marshalling, and emergency procedures, including first aid.
Communication and Coordination
Clear communication between workers, site supervisors, and traffic management operatives is vital to ensure smooth operations:
- Radio Communication: Radio or mobile communication should be used to coordinate traffic management operatives, particularly during setup and dismantling of TTM.
- Public Communication: Informing the public in advance of roadworks via signage, media, and local authorities helps minimise confusion and disruptions.
Night-Time and Adverse Weather Conditions
Special considerations are required for night-time operations and poor weather:
- Lighting: Adequate lighting must be provided for both workers and traffic. This includes floodlights for the work zone and additional lighting for signage and cones.
- Wet Conditions: Barriers and signs must be secured against high winds, and drainage must be assessed to avoid flooding in the work zone.
- Snow/Ice: During winter conditions, anti-skid surfaces and appropriate warning signage should be used to reduce the risk of traffic accidents near the work zone.
Chapter 8 of the Traffic Signs Manual is an essential reference for the planning and execution of temporary traffic management schemes. By following its guidance on design, signage, lane closures, pedestrian safety, and worker protection, construction teams can ensure that roadworks are safe for both road users and workers, while also minimising traffic disruptions. Regular training, risk assessments, and adherence to the standards laid out in Chapter 8 are key to successful traffic management in roadworks and other temporary scenarios.
