Contrast markings must meet both site requirements and technical property requirements.
The site requirement says that persons with reduced mobility or orientation ability should be able to access a building and otherwise use the site. It should be easy to find things like parking spaces and entry points for cars and open spaces, as well as walking paths, stairs, ramps and artificial guidance paths and actuators. Contrasts to the surroundings can be achieved with differing materials and brightness.
Technical property requirements for accessibility are set for important target points in buildings, as well as so that walkways, stairs, ramps and actuators should be easy to find and access. Some examples of important target points in buildings are entrance doors, elevator doors, reception counters, toilet doors, doors at and leading to escape routes, as well as information points.
In public premises, there should be logical guidance paths which lead the way between selected target points. Guidance surfaces in the floor can be arranged with different materials and with brightness contrasts.