What do solid lines and dashed lines indicate on roads?

• A. Solid lines indicate no passing; dashed lines indicate passing allowed when safe.
• B. Dashed lines indicate no passing; solid lines indicate passing allowed.
• C. Solid lines indicate only lanes; dashed lines allow lane changes.
• D. Dashed lines indicate bus lanes only.

Answer: (A)

Solid and dashed road lines tell you what you can or can’t do with passing and lane changes. A solid line means you must not pass another vehicle or cross that line to change lanes. It’s a boundary you’re not allowed to cross. A dashed line means you may pass or change lanes, but only if it’s safe to do so and you have enough clear space, signal your intention, and complete the move without cutting off anyone.

If the solid line is on your side, you must stay in your lane and cannot pass, even if traffic in the opposite direction has a dashed line. If the dashed line is on your side, you can pass when safe. This helps prevent head-on conflicts and keeps traffic orderly, especially on two-lane roads or where visibility is limited.