Where is the E-5 unidirectional barrier typically installed on the runway?

The E-5 unidirectional barrier is typically installed on the overrun area of the runway. This location is crucial for enhancing safety during the operation of the aircraft. The unidirectional barrier acts as a safeguard that prevents aircraft from inadvertently departing the runway, especially in exit scenarios where speed and directional control are critical. The overrun area is specifically designed to accommodate emergency situations, making it essential for barriers to be placed in these areas to provide an additional layer of protection.

While the other locations mentioned may be relevant in different contexts, the overrun is specifically intended for increased safety during unexpected incidents, making it the optimal choice for the installation of an E-5 unidirectional barrier.