Marker lights are used to mark a traffic accident, a crime scene, or an accident site. The powerful lights used are visible from a long distance and alert others to upcoming difficult or unsafe conditions. They are also used to alert emergency services such as police, fire departments, and ambulances so they can easily locate an accident site. Marker lights define a safety zone around your work area, ensuring your own safety, for example, if you are working on road construction or traffic rescue. By carrying simple marker lights with you on a trip, you increase the chances of being found by search and rescue teams if an accident were to occur. Marker lights are small, lightweight, and weather-resistant. It is important to choose marker lights that are waterproof and dustproof.