The entrance and exit on buses and trains are a central point of danger for the security in public transport. Safe crush protection and presence detection is not only for passengers and transport companies, but also for manufacturers of vehicles and vehicle doors! It is an important issue. By using ASO technology as a security sensor step and safety contact edges in the doors can these risks can be avoided. The constant inspection of the product quality according to ISO 9001-2008 ensures a long-lived and optimal system.