What are the two types of published RNAV routes?

The published RNAV (Area Navigation) routes are categorized primarily into two types: Q routes and T routes. Q routes are designed for high-altitude en route air traffic, typically used by jet aircraft and found above 24,000 feet in controlled airspace. They are primarily utilized for airways within the National Airspace System (NAS) that allow for direct navigation without the need for traditional ground-based navigation aids.

T routes, on the other hand, are designated for use primarily by lower altitude flights, generally below 24,000 feet. These routes help facilitate RNAV procedures for general aviation and smaller aircraft operating at lower altitudes. T routes can provide more efficient routing and are often used to maximize airspace utilization near busy airports or to improve the traffic flows.

The other options do not correctly represent the types of RNAV routes recognized in the current aviation system, as they reference route designations that are not associated with RNAV. Understanding the distinction between Q and T routes is essential for air traffic controllers to effectively manage aircraft movements and ensure safety and efficiency in the air traffic system.