What is indicated by a solid yellow line on a roadway?

Answer: B — Drivers must not cross

A solid yellow line on a roadway indicates that drivers must not cross it. This rule is in place to ensure safety by preventing vehicles from passing into oncoming traffic areas, which can create dangerous situations. The presence of a solid yellow line usually means that visibility is limited or that the road conditions are not suitable for passing. It reinforces the need for caution when driving on multi-lane roads where traffic flows in opposite directions, emphasizing that drivers should stay in their lanes for the safety of everyone on the road. This is crucial in maintaining safe travel circumstances and promoting responsible driving behaviors.