The term "Chapter 8" is commonly used within the highway industry, yet many individuals working in this field do not fully grasp its true meaning. 

In the United Kingdom, the regulations governing traffic signs are outlined in the Traffic Signs Regulations and General Directions 2016 (TSRGD), a Statutory Instrument derived from the authority of the Road Traffic Regulation Act 1984 and the Road Traffic Act 1988.

While the TSRGD succinctly outlines the design specifications for traffic signs, it lacks detailed guidance on their application within the road network. To bridge this gap, the Department for Transport has formulated the Traffic Signs Manual (TSM), a comprehensive document offering guidance on the utilisation and implementation of traffic signs. Comprising eight chapters, each addressing distinct aspects, the eighth chapter specifically provides guidance on employing traffic signs in roadworks and other temporary scenarios.

Therefore, when someone mentions the need for "Chapter 8," they are essentially expressing a requirement for traffic signs, barriers, or vehicle markings to be utilised in accordance with the guidelines outlined in the Traffic Signs Manual (TSM).