Final answer:
A double yellow line in the middle of a two-lane road means that drivers in both directions are not allowed to cross the solid yellow line to pass other vehicles.
Step-by-step explanation:
A double yellow line in the middle of a two-lane road means that prohibited overtaking is in effect, indicating that drivers in both directions are not allowed to cross the solid yellow line to pass other vehicles. This is done to ensure the safety of drivers and prevent head-on collisions. Violating this rule can result in fines or other penalties.