How many seconds does a turn signal flash once?
2 Answers
The flashing frequency of a turn signal is generally around 1Hz, meaning it flashes once per second. If the frequency suddenly increases, it may indicate a fault in one side of the turn signal or its circuit. The function of turn signals: Turn signals are controlled by electronic devices, but they still use sound to simulate the relay. They are activated when a motor vehicle turns to indicate that the turn signal is flashing and to alert vehicles in front, behind, and to the sides, as well as pedestrians, serving as an important indicator light. Types of turn signals: They can mainly be divided into three types: resistance wire type, capacitor type, and electronic type. The resistance wire type can further be divided into hot wire type (electrothermal) and wing type (spring-loaded), while the electronic type can be divided into hybrid type (with contact-type relays and electronic components) and fully electronic type (without relays).
The duration of a turn signal flash is approximately between 0.3 to 0.5 seconds, as the standard flashing frequency is about one to two times per second, and the actual illumination moment is very brief. While studying vehicle lighting systems, I discovered that this timing depends on bulb type and circuit design: traditional halogen bulbs have a slightly longer illumination time, around 0.5 seconds, whereas LED lights respond faster, potentially close to 0.3 seconds. Flashing frequency is regulated by standards - international regulations like ECE specify 60-120 flashes per minute, aiming to make turn intentions clearly noticeable to other drivers without causing visual distraction. If the flashing becomes too rapid, it may indicate a burnt-out bulb or circuit malfunction, where abnormal current increases flash frequency. Therefore, performing a simple light check before driving can prevent potential safety hazards.
