Final answer:
Double solid lines are usually found on a winding two-way road to indicate that passing is prohibited due to dangerous conditions, like limited visibility.
Step-by-step explanation:
Double solid lines on a road indicate areas where passing is not allowed due to increased danger, such as on a winding two-way road. These lines are used to indicate that traffic is only allowed to flow in one direction. They serve as a visual barrier to prevent vehicles from crossing into the opposing lane. These lines are used to provide a clear message to drivers that crossing the lines to overtake another vehicle is unsafe and, therefore, prohibited. Double solid lines are typically found in areas where road visibility is restricted, such as on curves, hills, or other locations that might impair a driver's view of oncoming traffic.