A broken white line in the middle of the road means what?

Answer: B — Traffic can pass but with caution

A broken white line in the middle of the road signals that traffic can change lanes. This line allows for lane changes to occur, making it clear for drivers that they have the option to pass other vehicles when it is safe to do so. The phrase "but with caution" emphasizes the need for drivers to ensure that it is safe before making a lane change, as there may be vehicles in adjacent lanes. In contrast, a solid line would indicate that lane changes are not permitted, which highlights the significance of the broken line in allowing flexibility for drivers. This understanding helps maintain traffic flow and safety on the roads.