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In automotive terminology, the turn signal (also known as "indicator") is an amber or red flashing light device installed on the front, rear, and sides of a vehicle, used to communicate driving intentions such as turning or lane changes to other road users. Its core function is to indicate directional changes through intermittent flashes, typically operated via a control stalk beneath the steering wheel—pushing left activates the left signal lights, while pushing right activates the right signal lights. Modern vehicle turn signal systems commonly employ electronic flasher units to control the flash rate, with a standard frequency of 60-120 flashes per minute. Some models additionally feature audible alerts and dashboard indicator lights to confirm operational status. Notably, turn signals are legally mandated safety equipment. Under Malaysia's Road Transport Act 1987, improper turn signal usage may incur fines up to 300 ringgit. For daily operation, drivers should activate signals at least 3 seconds before lane changes and manually deactivate them after completion (though some premium models include automatic cancellation). Regular bulb inspections are recommended to prevent unilateral failure that could cause misinterpretation. With technological advancements, certain newer vehicles now incorporate sequential turn signals or mirror-integrated side markers to improve warning effectiveness.

The prototype of the car turn signal can be traced back to 1914, when Hollywood movie star Florence Lawrence invented a manually button-controlled turn indicator but did not apply for a patent. In 1925, Edgar Walz obtained a patent for a turn signal device, but it was not widely adopted by car manufacturers. A milestone for modern electronic turn signals was in 1936 when Buick first equipped a light system controlled by relays. In 1939, this technology was named "Flash-Way Direction Signal" and became a standard feature for brands like Buick. It was characterized by using a combination switch under the steering wheel to control the flashing of front and rear bulbs, and had an automatic reset function. Early turn signals used the principle of bimetallic strips to achieve flashing, while most now have been upgraded to LED light sources. The standard flashing frequency is 60 to 120 times per minute, and an abnormally fast frequency usually indicates a bulb failure. The amber color design of turn signals has become the global mainstream due to its strong penetration, with only a few countries allowing red. This invention completely replaced the primitive method of drivers gesturing with their hands, significantly improving driving safety. Later, it also gave rise to the hazard warning light function, which is used in emergency parking or low-visibility scenarios. It is worth noting that Malaysian regulations also require turn signals to be amber, and their functional integrity is inspected during vehicle annual inspections.

Car turn signals are usually located on the left and right sides of the front and rear of the vehicle. The front left one is near the driver's position, the front right one near the front passenger's position, and the same applies to the rear. Some models also feature additional turn signals above or below the side mirrors to enhance visibility. The interior control switch is on the stalk at the lower left of the steering wheel, and the operation follows ergonomic principles: pushing the stalk down (counterclockwise) activates the left turn signal, while pushing it up (clockwise) activates the right turn signal. Modern vehicles are generally equipped with a "three-flash" function; a light tap on the stalk triggers three flashes, which is ideal for quickly alerting following vehicles during lane changes. Using turn signals must comply with safety regulations. It is recommended to activate them 10 seconds in advance to warn other road users. When pulling over to the right, the right turn signal should be engaged, and when pulling away from the curb, the left turn signal should be used. Proper use of turn signals not only prevents violations such as wrong-way driving but also serves as a fundamental safety practice. Their standardized placement and flashing pattern are designed to maximize signal recognition, ensuring all road users can respond appropriately.

Car turn signals are not identical; their design, function, and configuration vary due to differences in vehicle models, technical standards, and brands. In terms of basic functions, all turn signals are used to indicate the intention to turn or change lanes, using yellow light sources to ensure high visibility, and their flashing frequency generally follows the national standard of 60 to 80 flashes per minute. However, there are differences in specific implementation methods: traditional models mostly use xenon tubes, while modern models such as some luxury cars or new energy vehicles have popularized LED turn signals, which offer advantages of higher brightness, longer lifespan, and energy efficiency. In terms of operation logic, most vehicles are controlled via the lever on the left side of the steering wheel following the "up for right, down for left" rule, but some brands (such as certain Japanese cars) may use the opposite design, and high-end models even feature sequential turn signals or automatic steering functions. Additionally, the base types of turn signals (such as P21W, PY21W) and installation positions (beside headlights, rear of the vehicle, side mirrors, etc.) also vary depending on the vehicle's positioning. Drivers should note that if the turn signal flashes abnormally fast, it may indicate a bulb failure, requiring prompt inspection and repair to ensure driving safety. Proper use of turn signals not only reduces accident risks but also constitutes a fundamental requirement for traffic regulation compliance.

Early cars indeed had no turn signals; drivers had to use hand gestures to indicate their turning intentions until 1938, when Buick first introduced a relay-controlled turn signal system. Modern turn signals use yellow lights, as they have the strongest penetration in the light spectrum and can effectively improve visibility in rainy or foggy weather. This design complies with the regulatory requirements of most countries around the world, including local vehicle certification standards. From a technical evolution perspective, turn signals have evolved from mechanical relays to today's LED and dynamic turn signals, which not only consume less energy but also feature adaptive lighting functions—for example, some high-end models adjust the light angle according to the steering wheel's turning angle. The "clicking" prompt sound of turn signals originated from the switching sound of early mechanical relays. Although it is now replaced by electronic simulation, the sound feedback is retained to remind the driver of the operating status. It is worth noting that U.S.-spec cars allow red turn signals, but locally registered vehicles must follow the yellow standard, which is a unified regulation based on traffic safety and visual warning effects.