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MODERN, INNOVATIVE EQUIPMENT FOR RELAXED DRIVING

 

The C4 features a range of modern, efficient driving aids designed for easy, relaxed driving. 

  • The lane departure warning system is a major step forward in driving safety. At speeds of over 80 kph, this system warns the driver if the car crosses a continuous or broken lane marking, if the indicator has not been activated. A vibrating mechanism mounted in the car seat is triggered on the side corresponding to the direction of vehicle drift, enabling the driver – who may have suffered a moment’s distraction – to take corrective action in time.

  •  Xenon dual-function, directional headlamps (dipped and full beam), generally reserved for vehicles further up the market, provide improved lighting for cornering.

  •  The C4 also features equipment more rarely found in this segment, such as a cruise control, a speed limiter, front and rear parking assistance with manoeuvres displayed on the multifunction screen, and a low tyre-pressure warning system.


INNOVATIVE AND MODERN DRIVING AIDS

 

The C4 driver has access to a range of modern and innovative driving aids which, combined with the interior comfort and uncluttered design of the cabin, let him take to the road with a relaxed mind. 

The lane departure warning system

The lane departure warning system detects a lane change on a motorway or fast road from speeds of 80 kph. It warns the driver if the car crosses a continuous or dotted lane marking, if the indicator is not activated. A vibrating mechanism mounted in the car seat is activated on the side corresponding to the direction of vehicle drift, enabling the driver – who may have suffered a moment’s distraction – to take corrective action in time. 

Six pairs of infrared sensors located under the front bumper monitor and detect a lane change. Each pair is made up of an infrared emitting diode and a detection cell. The detection function relies on variations in the infrared beam reflected by the diode on the road surface. 

A control unit receives the information and activates a vibrating mechanism in the driver’s seat, on the side corresponding to the drift. Alerted by the vibrations on the left- or right-hand side, the driver can then steer the car back on course. This system, which can be activated or deactivated from the dashboard does not disturb the passengers, and leaves the driver free to perform manoeuvres.

Taking a significant step forward in terms of safety, this innovation is one of the solutions developed to make up for a loss of concentration or a moment’s distraction on the part of the driver.

 

Xenon dual-function directional headlamps

The C4 is also available with a feature that remains rare in this segment: Xenon dual-function directional headlamps (low beam and high beam).

When the car takes a corner, the beam lights up the inside of the curve. The beam is angled by up to 15° (8° for the headlamp on the outside of the bend, and up to 15° for the headlamp on the inside). This feature allows the driver to see where he is going and to distinguish other road users and possible obstacles. This is an important advantage in terms of safety since, at a speed of 110 kph, the car covers more than 30 metres every second. When Citroėn developed this function for the DS, the controls were mechanical. Today, they rely on electronics. 

This swivelling beam enhances the lighting quality of the Xenon dual-function discharge lamps, which are active in both the low-and high-beam positions. 

By improving driver visibility and reducing visual fatigue, this feature brings significant gains in safety and driving pleasure.

 

Front and rear parking assistance

The C4 brings customers an effective parking aid, with the introduction of front parking assistance, alongside the rear parking assistance function. 

The sensors work in the same way at the front as at the back. Four sensors located in the bumper inform the driver that an obstacle is present in their detection area when vehicle speed is lower than 10 kph. The system emits a series of beeps that gradually become more frequent as the car approaches the obstacle, becoming a continuous signal when it is just a few centimetres away.

The system lets the driver view the distance separating the car from the obstacles at both front and rear. The multifunction screen displays the silhouette of the vehicle, along with six detection areas. 

The parking assistance function can be disabled from the dashboard.

 

Cruise control and the speed limiter

Cruise control and the speed limiter round out the list of new comfort and safety equipment.

Cruise control lets the driver keep the car going at a programmed speed without using the accelerator pedal.

With the speed limiter, the driver defines a maximum speed not to be exceeded. If he wishes to exceed this speed from time to time, he can stamp down hard in order to bypass the end-of-travel stop under the accelerator pedal.

For the cruise control and the speed limiter, the driver simply programmes a required speed using the function on the fixed-centred controls steering wheel. A readout on the translucent instrument cluster then shows the programmed speed and the status (active/inactive) of each system.

 

The low tyre-pressure warning system

Already present on the C5 and the C8, the low tyre-pressure warning function enhances the range of safety equipment present on the C4. This system measures the pressure of all four tyres. Each tyre is fitted with an emitter and a pressure sensor, which sends information to the central control unit. When one of the tyres drops below its preset pressure level, a message immediately flashes up on the multifunction screen to warn the driver. At the same time, a buzzer sounds. In the event of a puncture, the “Stop” indicator will also come on. In this way, this feature detects any under-inflation that could have an adverse impact on the car’s stability and on the safety of the occupants. 

In addition to enhancing safety, this function also encourages the driver to check tyres regularly and to correct inflation levels. These checks bring gains in terms of reduced road noise, fuel consumption and tyre wear.