What must you do if there is oncoming traffic and you see a solid double yellow line?

When encountering a solid double yellow line while facing oncoming traffic, the appropriate action is to stay in your lane and not pass. Solid double yellow lines indicate that passing is prohibited in both directions. This traffic regulation is in place to enhance safety by preventing overtaking when visibility is limited or when it is unsafe to do so. Maintaining your position in your lane ensures that you avoid any potential collisions with oncoming vehicles, which is crucial for your safety as well as the safety of others on the road.

In this scenario, other actions like attempting to pass or speeding up are not advisable, as they could lead to dangerous situations. Taking a different route may be an option in some circumstances, but when simply faced with a solid double yellow line, the safest and most responsible choice is to remain in your lane.