[header] How to pass safely on a two lane road [title] Look at traffic signals and lane markings to ensure passing is legal. [step] Check for signs indicating whether you're in a designated passing zone or non-passing zone. If you're unsure, look at the lane markers. 
[substeps] A solid yellow line indicates it's unsafe to pass into oncoming traffic. A single dotted yellow line or a solid yellow line with a dotted line on your side of traffic indicates that it's a safe move.