Threshold markings are visual indicators placed at the entrance of a space, often used to signify a change in environment or to guide movement. They can be found in various settings, such as buildings, airports, and public transportation, helping people recognize where to enter or exit. These markings can also serve safety purposes, alerting individuals to potential hazards like steps or uneven surfaces. By providing clear visual cues, threshold markings enhance accessibility and improve navigation for everyone, including those with mobility challenges or visual impairments.