What are T-Routes?

T-Routes, or "T" routes, are specifically designed for aircraft operating at low altitudes that require arrival and departure routes to be more efficiently managed in airspace. These routes are part of the area navigation (RNAV) system and are mandated to be used together with RNAV capabilities.

These fixed routes provide a structured path for aircraft that might be flying below 24,000 feet and are essential in helping to enhance safety and efficiency in low-altitude routing, especially for cargo and general aviation operations. By using RNAV systems, which include GPS and other satellite navigation technologies, T-Routes enable more precise navigation and reduce the need for direct line-of-sight between navigational aids, helping to streamline air traffic management and minimize the risk of midair collisions.

In contrast, other options are less relevant as T-Routes are specifically not designed for VFR (Visual Flight Rules) traffic, which operates without reliance on instruments for navigation; they also do require navigation systems, unlike what is suggested in the second option; and they are not exclusive to high-level commercial aviation, which operates mainly at higher altitudes and often uses different routing conventions.