Final answer:
When encountering a yellow 'x' signal on a lane, the appropriate response is to prepare to stop. This signal serves as a warning of a lane closure or obstruction ahead, necessitating caution and readiness for a complete stop.
Step-by-step explanation:
In this case, the signal being referred to is the yellow 'x' signal. When encountering a yellow 'x' signal on a lane, the appropriate response is to prepare to stop. This signal serves as a warning of a lane closure or obstruction ahead, necessitating caution and readiness for a complete stop.