Advance Clear to Slow · Rule 414

Indication: Proceed, approaching second signal at SLOW speed.

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