A dashboard turn arrow indicates signal activity, but it does not establish that every exterior lamp is working. A faster-than-usual flash can be a clue to a lighting concern, though the meaning varies with the vehicle's lamp system.
Check both sides and the hazard function while safely parked. Record which exterior lights fail, remain on, or behave differently from the others.
Contact The Car Clinic of Miami if operation is inconsistent. Mention any recent bulb change or trailer connection, and do not rely on the sound or dashboard arrow alone to verify the exterior signals.