Companies in the Traffic & Zone Marking Service industry are responsible for the installation and maintenance of road markings, signs, and safety devices. This industry plays a crucial role in ensuring the safety of drivers, pedestrians, and cyclists on public roads and highways. The services provided by companies in this industry include the application of paint, thermoplastic, and other materials to create lane markings, crosswalks, and other traffic control devices. They also install and maintain traffic signs, guardrails, and other safety features to ensure that roads are safe and easy to navigate.