UK Road Works: The Design & Implementation of Temporary Traffic Management (GG 117)

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Temporary traffic management (TTM) is essential in maintaining road safety and efficiency during road works. The GG 117 standard, published by National Highways, provides comprehensive guidelines for the design and implementation of temporary traffic management and road works across the UK. This blog explores the key principles, safety measures, and best practices outlined in GG 117, ensuring road projects meet the highest safety and operational standards.

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Understanding GG 117: A Key Standard for UK Road Works

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What is GG 117?

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GG 117 is part of the Design Manual for Roads and Bridges (DMRB) and sets out the requirements for planning and executing temporary traffic management during highway maintenance, construction, and emergency operations. It replaces older documents and incorporates the latest best practices and technological advancements in traffic control.

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Scope and Implementation

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• Applies to motorways and all-purpose trunk roads
• Guides the design and execution of safe and efficient TTM
• Requires compliance with health and safety regulations
• Supports enhanced mobile carriageway closure (EMCC) techniques
• Aligns with the Traffic Signs Manual (TSM) Chapter 8

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Key Requirements for Temporary Traffic Management (TTM)

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1. Safety First: Protecting Road Workers and Users

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Safety is the cornerstone of GG 117. The Health and Safety at Work Act 1974 mandates risk assessment, proper training, and incident management to minimize hazards during road works. The "as low as reasonably practicable" (ALARP) principle ensures risks are reduced effectively.

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Safety Measures in GG 117:

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✔ Risk Assessments – Identifying potential hazards and mitigating them
✔ Traffic-Free Zones (TFZ) – Keeping work zones clear of vehicles
✔ Incursion Warning Systems – Alerts for unauthorized entry into work zones
✔ Operator Training – Ensuring qualified professionals manage TTM

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2. Enhanced Mobile Carriageway Closures (EMCC)

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The EMCC technique is a major innovation in GG 117. It allows road workers to operate in a controlled, traffic-free environment without a full road closure.

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How EMCC Works:

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1. Traffic is gradually slowed by an EMCC vehicle
2. A temporary traffic-free zone is created
3. Road works are completed while ensuring worker and driver safety
4. The EMCC vehicle gradually increases speed to normalize traffic flow

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💡 Benefits of EMCC:

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• Reduces the need for police support in rolling roadblocks
• Enhances efficiency for short-term maintenance tasks
• Minimizes disruption to public traffic

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3. Traffic Flow & Planning Considerations

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Proper planning ensures minimal traffic congestion. GG 117 outlines how traffic volumes, road type, and work duration should be factored into the TTM design.

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Key Considerations:

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✔ Traffic Flow Analysis – Determining the best time to schedule road works
✔ Signage & Road Markings – Proper placement of warning signs
✔ Multiple Lane Management – Ensuring safe lane diversions
✔ Digital Alerts & Communications – Using advanced technology to manage traffic

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4. Equipment & Training Standards

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Every TTM operation in the UK must comply with strict equipment and training standards.

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Operator Requirements:

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• Must complete certified training on TTM and EMCC operations
• Must be familiar with digital warning systems
• Should conduct pre-work briefings for all involved staff

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Essential Equipment:

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✔ EMCC Vehicles – Equipped with warning signs, CCTV, and digital alerts
✔ Signage Systems – Approved road signs compliant with the Traffic Signs Regulations and General Directions (TSRGD)
✔ Two-Way Radio Communication – Ensuring real-time updates

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Conclusion

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The GG 117 standard is a game-changer in the way the UK manages temporary traffic during road works. By implementing its principles, road authorities and contractors can enhance safety, reduce disruptions, and improve efficiency in infrastructure projects.

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For those involved in highway maintenance, civil engineering, or transport planning, understanding and following GG 117 is essential. With the right planning, equipment, and safety measures, UK road works can be carried out more effectively than ever before.

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