RNP Based Procedures - best choice and path to future
Consider adopting modern RNP based procedures for traffic separation. They have been used successfully now for well over a decade, in several states in particular, even for far more critical terrain separation. RNP is also used internationally, at higher RNP levels, such as for oceanic and remote area traffic separation. If you have suitable fractions of FMS RTA equipped aircraft operating at the relevant airfields, or regions, use of RTA in conjunction with 3D RNP procedures can also help.