When approaching taxiway holding lines from the side with the continuous lines, what must the pilot do?

• A. Cross the lines with ATC clearance.
• B. Cross the lines only when the other aircraft is clear.
• C. Should not cross the lines without ATC clearance.
• D. Continue taxiing without stopping.

Answer: (C)

Holding position markings mark the boundary you must not cross without explicit clearance. Approaching from the side with the solid lines, you are on the side that requires you to stop. You must not cross those lines until ATC clears you to do so, even if another aircraft seems clear. The dashed-line side is the side you may cross from when clearance is given, but on the solid-line side you wait for ATC authority. So the correct action is not to cross the lines without ATC clearance.