The helo route was likely instituted decades ago when traffic was lower. The NTSB incident database search turned up a close call between rotary and fixed wing

The helo route was likely instituted decades ago when traffic was lower. The NTSB incident database search turned up a close call between rotary and fixed wing just about every month in the last several years. This was a accident waiting to happen. This is not by any means the only midair collision where a crew was avoiding a different aircraft.