Advance Clear to Stop · Rule 415

Indication: Proceed, prepared to Stop at second signal.

1. A high mast, single aspect signal displaying flashing yellow.
2. A high mast, staggered, double aspect signal displaying flashing yellow on the top, red on the bottom.
3. A high mast, inline, double aspect signal displaying flashing yellow on the top, red on the bottom.
4. A high mast, inline, triple aspect signal displaying flashing yellow on the top, red in the middle, red on the bottom.