The operation of Unmanned Aerial Vehicles (UAVs) in civil airspace is restricted by the aviation authorities. which require full compliance with regulations that apply for manned aircraft. This paper proposes control algorithms for a collision avoidance system that can be used as an advisory system or a guidance system for UAVs that are flying in civil airspace under visual flight rul... https://thebrickes.shop/product-category/spring-riding-toys/