On a four-lane divided roadway or a one-way road, what does a solid yellow line indicate?

A solid yellow line on a four-lane divided roadway or a one-way road indicates the left edge of the pavement. This marking is important for drivers as it helps delineate where the roadway ends in relation to oncoming traffic or barriers. It provides clear guidance, especially in situations where the road may be divided or where there is no physical barrier, ensuring that drivers are aware of the safe area to remain within.

In this context, the left edge marking serves to alert drivers to the potential dangers on the left side, such as an opposing lane of traffic or a roadside hazard, thereby promoting safety on the road. Knowing that a solid yellow line indicates the left edge helps drivers be more observant of their surroundings and maintain proper positioning on the roadway.