Something blocks your line of sight. On a road it could be hills, curves, etc.
during periods of restricted visibility
Lights must be on during periods of restricted visibility
Lights must be on during periods of restricted visibility
one prolonged blast
Navigation lights must be on during periods of restricted visibility.
lights must be on during periods of restricted visibility
The should comply with IRPCS and be on between sunset and sunrise and in restricted visibility
5 seconds of rapid bell ringing
one prolonged blast
Rules of the Road Rule 35 Sound Signals in Restricted Visibility/International (a) A power driven vessel making way through the water shall sound at intervals of not more than 2 minutes one prolonged blast.
5 seconds of rapid bell ringing
A vessel at anchor or aground in restricted visibility