This is worth a read regarding issues in the USA and mid air collisions, particularly Alaska where the number of landing areas within a specified area makes the Ballina/Lismore/Casino area look desolate.
https://www.ntsb.gov/investigations/...ts/AAR2104.pdf
2.3 Lack of Alerting This accident underscores the serious inherent limitations of the see-and-avoid concept, which remains the primary means of collision avoidance in VFR conditions. Scientific literature on human performance in aviation (Gibb et al 2010b) and previous NTSB accident reports (discussed below) have described these limitations and argued that they cannot be overcome simply by pilot diligence in scanning for traffic. In previous midair accident investigations, the NTSB has noted that CDTI can supplement pilots’ visual scans and provide awareness of conflicting traffic targets minutes before these targets become a collision threat. In 2015, a Cessna 150M and a Lockheed Martin F-16CM collided in flight near Moncks Corner, South Carolina. Because of the high closure rate involved, each pilot had a limited opportunity to see and avoid the other airplane. A postaccident simulation showed that devices in the cockpit that display or alert to traffic conflicts might have provided both pilots with clear traffic depictions and aural alerts as the conflict developed and could have enabled them to avoid the collision.62 In addition, in 2015, a Cessna 172M and an NA265-60SC Sabreliner collided while maneuvering for landing at Brown Field Municipal Airport, San Diego, California. A postaccident simulation showed that a CDTI in one or both of the airplanes could have provided a traffic picture that likely would have allowed the pilots to become aware of and look for the other airplane and may have prevented the accident.63 As a result, in 2016, the NTSB issued Safety Alert 58, “Prevent Midair Collisions: Don’t Depend on Vision Alone,” to inform pilots of the benefits of technologies that provide traffic displays and alerts in the cockpit to enhance safe separation from traffic.64
Here is Safety Alert 58;
https://www.ntsb.gov/Advocacy/safety...nts/SA-058.pdf