GG 184 UK – Specification for the Use of Computer-Aided Design in Infrastructure Projects

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In today's digital age, infrastructure projects in the UK demand precision, collaboration, and standardized data management. One of the key tools enabling this is GG 184, a document that outlines the Specification for the Use of Computer-Aided Design (CAD). Issued by National Highways as part of the Design Manual for Roads and Bridges (DMRB), GG 184 ensures that CAD data is produced and shared in a consistent and structured manner.

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This blog provides an in-depth look into GG 184, its objectives, applications, benefits, and why it is vital for all UK-based infrastructure design professionals.

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What is GG 184?

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GG 184 is a specification document that defines how CAD systems should be used throughout the lifecycle of infrastructure projects—from concept and design to construction and maintenance. It replaces the former IAN 184/16 and aligns with global standards, including BS EN ISO 19650, which governs the organization and digitization of information about buildings and civil engineering works.

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Why GG 184 Matters

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The primary purpose of GG 184 is to create a unified approach for managing digital design data. This includes naming conventions, metadata management, file formats, and methods for data exchange. With multiple stakeholders involved in large-scale UK road and bridge projects, a lack of standardization can lead to confusion, miscommunication, and costly errors. GG 184 eliminates those risks by setting clear, enforceable guidelines.

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Where GG 184 Applies

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GG 184 is mandatory for all projects under the purview of the Overseeing Organisation, such as National Highways. It applies to:

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• Motorway and trunk road improvement schemes
• New construction and major rehabilitation works
• Any project that involves digital design data using CAD systems

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Whether the project is small or large, GG 184 ensures that data integrity and consistency are maintained throughout.

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Key Components of GG 184

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1. File Naming Convention

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Files created using CAD must follow a strict naming structure. Each file name includes fields such as project code, originator, volume, location, type, role, and a unique number. These elements are separated by hyphens for clarity.

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This ensures that any project participant can immediately understand what a file contains, who created it, and where it fits into the broader scope of work.

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2. Metadata Requirements

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Metadata is essential for file management. GG 184 mandates the inclusion of key metadata for every CAD file, such as:

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• Drawing title and description
• Revision number
• Status and project stage
• File creation and issue date
• File type and role

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Metadata enhances traceability and ensures that outdated or incorrect files are not used during project development.

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3. CAD Drawing and Model Standards

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GG 184 promotes the use of 3D CAD models enriched with structured data. It also requires drawings to be:

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• Legible at all print sizes
• Annotated with consistent text styles and scales
• Presented with appropriate line types, dimensions, and hatching
• Compliant with standards like BS EN ISO 13567 and Uniclass 2015

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The goal is to make CAD outputs readable not only to humans but also to machines—supporting integration with BIM and digital twin systems.

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4. Information Exchange Protocols

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When CAD files are shared between teams or submitted to the Overseeing Organisation, they must:

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• Be delivered in both native (editable) and immutable (e.g., PDF) formats
• Follow a standard transmittal format that includes all file metadata
• Avoid proprietary file formats unless specifically approved

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This ensures compatibility, long-term accessibility, and regulatory compliance.

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5. Survey and Topographic Data Standards

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Topographic and environmental surveys must follow specific formatting rules. These include:

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• Delivering files as 3D models with correctly layered data
• Using clearly defined symbols for different features
• Ensuring closed boundaries for enclosed features
• Providing linked attributes instead of floating text

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This guarantees that the survey data integrates smoothly into the design process.

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6. Drawing Presentation and Title Blocks

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GG 184 lays out clear guidance on how drawings should be composed, including:

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• Attaching title blocks in paper space
• Including project title, scale, revision, and originator details
• Using standard scales and clear annotations
• Maintaining consistency across multidisciplinary drawings

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These practices reduce confusion and facilitate faster approvals.

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7. Supported File Formats

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The document supports a range of open and proprietary file formats including DWG, DGN, PDF, XML, and shapefiles. The preference is for open standards that promote accessibility and interoperability.

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How GG 184 Supports Digital Transformation

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GG 184 directly supports the UK Government’s Digital Built Britain strategy. By enforcing the use of consistent digital data practices, it helps in:

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• Accelerating project delivery
• Reducing rework and waste
• Improving asset lifecycle management
• Enabling BIM Level 2 and beyond

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Adopting GG 184 isn't just about meeting standards—it's about transforming how infrastructure is designed, built, and maintained.

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Implementation Guidance

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Projects must incorporate GG 184 into their Information Delivery Plan (IDP) and follow the implementation approach defined in GG 101. Contractors and consultants are expected to:

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• Follow the naming and metadata structures precisely
• Submit data in required formats
• Seek approval before using custom tools or workflows

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Deviation from the standard is only allowed with explicit approval from the Overseeing Organisation.

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Benefits of Using GG 184

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GG 184 offers several advantages for infrastructure projects in the UK:

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• Promotes collaboration between teams and disciplines
• Enhances the reliability and reusability of design data
• Reduces project delays due to miscommunication
• Facilitates compliance with national and international BIM mandates
• Streamlines operations across the asset lifecycle

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By following a structured approach to CAD, teams can work more efficiently, reduce risk, and deliver better outcomes.

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Conclusion

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The GG 184 specification is a vital tool for ensuring that infrastructure projects in the UK run smoothly, efficiently, and in compliance with modern digital standards. It brings order to what could otherwise be a chaotic digital environment and lays the foundation for smart infrastructure management.

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For professionals working on highways, bridges, or any major civil engineering works, adhering to GG 184 isn’t optional—it’s essential for success in the UK’s digital construction ecosystem.

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RoadVision AI is transforming infrastructure development and maintenance by harnessing artificial intelligence and computer vision AI to revolutionize road safety and management. By leveraging advanced computer vision artificial intelligence and digital twin technology, the platform enables the early detection of potholes, cracks, and other road surface issues, ensuring timely repairs and better road conditions. With a mission to build smarter, safer, and more sustainable roads, RoadVision AI tackles challenges like traffic congestion and ensures full compliance with IRC Codes. By empowering engineers and stakeholders with data-driven insights, the platform reduces costs, minimizes risks, and enhances the overall transportation experience.

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