1. Plural of presignal; signals or warnings given in advance of a main signal, especially in railway or traffic systems.
Usage: technical; chiefly British

1. Third-person singular present tense of presignal; to give a signal or warning in advance.
Usage: technical; rare

Examples

• The railway system uses presignals to alert drivers before the main signal.
• Presignals on the track help prevent accidents by giving advance notice.
• The driver presignals the turn before changing lanes.
• Modern traffic management presignals upcoming hazards to motorists.
• The conductor presignals the station stop to passengers.