Which situation requires that you stop fully before making a left turn on red on a US installation?

When making a left turn on red within a U.S. installation, the requirement to come to a complete stop before proceeding is a fundamental traffic rule aimed at ensuring the safety of all road users. This is especially crucial in a military environment where traffic can include not just personal vehicles but also military personnel and government vehicles that may operate under different traffic regulations.

Fully stopping allows drivers to check for oncoming traffic and pedestrians that may not be visible if they attempt to make the turn without stopping. Following this guideline helps in minimizing risks of accidents, which can be particularly important on a military base where there may be specific protocols in place for vehicle operation.

The other scenarios presented do not reflect comprehensive safety practices. Making a left turn on red at any time without a complete stop would not ensure the necessary level of caution and awareness for surrounding traffic conditions, regardless of the time of day, presence of signs, or the day of the week. Thus, the safest and most responsible action, always required, is to stop fully before making a left turn on red.