from a stopped position. This feature holds the brake for you while you transition between the brake pedal and the gas pedal. For manual cars, this feature holds the brake for you while you transition between the brake pedal, the clutch, and the gas pedal. Lane centering assists the driver in keeping the vehicle centered in a lane. A lane-centering system may autonomously take over the steering when it determines the driver is at risk of deterring from the lane. This system uses cameras to monitor lane markings to stay within a safe distance between both sides of the lane. Lane change assistance helps the driver through a safe completion of a lane change by using sensors to scan the vehicle's surroundings and monitor the driver's blind spots. When a driver intends to make a lane change, the vehicle will notify the driver through an audio or visual alert when a vehicle is approaching from behind or is in the vehicle's blind spot. The visual alert may appear in the dashboard, heads-up-display, or the exterior rear-view mirrors. Several kind of lane change assistance might exist, for instance UNECE regulation 79 considers: "ACSF (Automatically commanded steering function) of Category C" (...) a function which is initiated/activated by the driver and which can perform a single lateral manoeuvre (e.g. lane change) when commanded by the driver. "ACSF of Category D" (...) a function which is initiated/activated by the driver and which can indicate the possibility of a single lateral manoeuvre (e.g. lane change) but performs that function only following a confirmation by the driver. "ACSF of Category E" (...) a function which is initiated/activated by the driver and which can continuously determine the possibility of a manoeuvre (e.g. lane change) and complete these manoeuvres for extended periods without further driver command/confirmation. Rain sensors detect water and automatically trigger electrical actions, such as the raising of open windows and the closing of open convertible tops. A rain sensor can also take in the frequency of rain droplets to automatically trigger windshield wipers with an accurate speed for the corresponding rainfall. Traction control system (TCS) helps prevent traction loss in vehicles and prevent vehicle turnover on sharp curves and turns. By limiting tire slip, or when the force on a tire exceeds the tire's traction, this limits power delivery and helps the driver accelerate the car without losing control. These systems use the same