What must vehicles do when the yellow light is flashing at the intersection?

When a yellow light is flashing at an intersection, it indicates that caution is required. Typically, this means that drivers should slow down and prepare to stop, as the yellow flashing light serves as a warning that the signal is about to change or that there may be hazards ahead.

For vehicles, the appropriate action is to approach the intersection with increased awareness and to stop if it is safe to do so. In practice, this often means that all vehicles, irrespective of size, should be prepared to yield or stop. The flashing yellow light does not require vehicles to continue through the intersection without stopping; instead, it is a signal for caution and to be prepared for a potential stop.

In this context, saying that certain vehicles must stop (like the answer mentioning only Vehicles 1 and 2) does not align with the standard traffic rules regarding flashing yellow lights, which generally apply to all vehicles equally. Therefore, the correct understanding is focused on the caution needed rather than specific vehicle classifications. It is important to remember that the aim of the flashing yellow light is to ensure safety by alerting all drivers to reduce speed and stay vigilant.