A pilot taxiing at a towered airport sees a flashing white light from the tower. What should the pilot do?

1. 1Taxi clear of the runway in use
2. 2Return to the starting point
3. 3Stop where the airplane is
4. 4Proceed across the runway

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 4-3-13 Traffic Control Light Signals (TBL 4-3-1), page 257