Final answer:
Double solid lines on the road indicate that you cannot pass other vehicles by crossing these lines, with the exception of making left turns to enter or exit the highway. This traffic rule enhances safety, especially where passing would be dangerous. Observing these lines, along with traffic signals and speed limits, is essential for road safety.
Step-by-step explanation:
Double solid lines on the roadway serve an important purpose in traffic management. These lines mean that you are not permitted to cross them for the purpose of overtaking or passing other vehicles. This traffic rule is in place for safety reasons, ensuring drivers maintain their lanes in areas where visibility or road conditions make passing unsafe. However, there are exceptions to this restriction.
The correct answer to the student's question is: You cannot go across the lines except to turn left to enter or leave the highway. This allows drivers to make safe turns into driveways, businesses, or intersecting roads where appropriate, despite the presence of double solid lines.
It's important to observe traffic signals and the posted speed limit to ensure safety. For instance, if a traffic signal is present, vehicles must slow down and cannot simply speed through, which could be the case at an intersection with merely a stop sign. Maintaining proper speed and observing road markings like double solid lines play significant roles in traffic safety and flow.