Final answer:
Passing is permitted on the side of the road with the broken line, indicating that lane changes or passing other vehicles is allowed in that area, when safe.
Step-by-step explanation:
When there are two centerlines down the center of the roadway, one solid and one broken, passing is permitted on the side with the broken line. This is because broken lines on roads indicate that drivers are allowed to change lanes or pass other vehicles, when it is safe to do so. In contrast, a solid line indicates that drivers should not cross the line because it's unsafe or illegal to pass in that area, such as oncoming traffic lanes or where visibility is limited. Therefore, passing is permitted on the side with the broken line, assuming all other conditions for safe passing are met.