Stop · Rule 439

Indication: Stop.

1. A high mast, single aspect signal displaying red with an ‘A’ plate on the mast.
2. A high mast, inline, double aspect signal displaying red on the top, red on the bottom.
3. A high mast, inline, triple aspect signal displaying red on the top, red in the middle, red on the bottom.
4. A double aspect, dwarf signal displaying red on the top, red on the bottom.
5. A single aspect dwarf signal displaying red.