Question

is the driver of the bottom car allowed to cross into the lane to the left? image of a road with two cars, one red above a black one, and yellow dashed lines
the driver may change lanes, but is not allowed to pass the car ahead.
yes, the driver may change lanes and continue to travel in the left lane.
no, the driver must not change lanes.
yes, the driver may change lanes and pass when safe.

Explanation:

The road has a single broken yellow line, which allows drivers to cross into the adjacent lane to pass slower vehicles, provided it is safe to do so. This means the bottom car's driver can change lanes and pass the red car when conditions are safe.

Answer:

Yes, the driver may change lanes and pass when safe.