Honda city SV i vtec spoiler With Brake Light

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An active spoiler is one that dynamically adjusts while the vehicle is in operation based on conditions presented, changing the spoiling effect, intensity or other performance attribute. Found most often on sports cars and other passenger cars, the most common form is a rear spoiler that retracts and hides partially or entirely into the rear of the vehicle, then extends upwards when the vehicle exceeds a specific speed, such as the active spoiler in the  Active front spoilers have been implemented on certain models as well, in which the front spoiler or air dam extends further towards the road below to reduce drag at high speed. In most cases the deployment of the spoiler is achieved with an electric motor controlled automatically by the on-board computer or other electronics, usually based on vehicle speed, driver setting or other inputs. Often the driver can manually deploy the spoiler if desired, but may not be able to retract the spoiler above a certain speed because doing so could dangerously diminish the high-speed handling qualities of the vehicle.

Active spoilers can offer additional benefits over fixed spoilers. Cosmetically, they can allow a cleaner or less cluttered appearance when the vehicle is parked or traveling at low speeds, when it is most likely to be observed. A spoiler that hides may be appealing to vehicle designers who are seeking to improve the high-speed aerodynamics of an iconic or recognizable model (for example the without drastically changing its appearance. Hiding a spoiler at low speeds can improve aerodynamics as well. At low speeds, a fixed spoiler may actually increase drag, but does little to improve the handling of the vehicle due to having little airflow over it. A retractable front spoiler can reduce scraping of the car on curbs or other road imperfections, while still reducing drag at high speeds.

Powered fans, such as in the do the equivalent of spoilers and increase the down force and hence traction and handling of the vehicle. Research continues on the use of fans to alter the aerodynamics of vehicles.

Spoilers are supposed to change airflow above, around and underneath vehicles to reduce wind resistance (or drag) or use the air to create more down force and enable more grip at high speeds. They’re designed to “spoil” the airflow to reduce its negative effects.