Final answer:
A flashing yellow x on lane signals instructs drivers to proceed with caution, not to stop or speed up, but to remain alert to changing conditions.
Step-by-step explanation:
The flashing yellow x on lane signals means that drivers should proceed with caution. This signal does not instruct drivers to stop or to speed up but indicates that the lane can be used, however, they should be alert and aware of changing conditions. It does not function like a regular traffic signal that tells you when to stop or go. Instead, it is to caution drivers that they should be prepared for potential hazards or changes in traffic patterns. In contrast to a yellow light at an intersection, which means the signal is about to turn red and you should prepare to stop, a flashing yellow x is typically used in traffic management systems where lane usage might change due to varying traffic conditions or other temporary situations such as construction zones.