As a result of this accident and other near mid-air collisions (NMAC) in terminal control areas, the Federal Aviation Administration required that all commercial aircraft be equipped with traffic alert and collision avoidance systems (TCAS), and required that light aircraft operating in dense airspaces be equipped with "Mode C" transponders that could report three-dimensional position.
Sad isn't it that some countries need corpses before they act.
This [in this thread] from a junior NAStronaut
The weeks readings thereafter affirm the noisest have resorted to the usual vitriol to deflect their inevitable loss just as in the low level ADSB debates.
Silly people!
ADS-B not only enhances on-board anti collision systems, it also provides an ultra low cost ATS tool for [amongst other things] ensuring transponders are on.
That said, without primary radar, no-radio/no TXPDR VCA's cannot be totally ruled out.
I would like to see TXPDR's [including ES ADS-B OUT] wired in to all aircraft with an air switch, and a pullable circuit breaker only [in case of malfunction or fire] to minimise switch on omission. By doing so, whilst masters are on, the ADS-B is outputting the required ground signals, and when at flying speed, outputting required airborne signals.