Assistance systems & safety.

smart forfour – assistance systems and safety

Active, passive, innovative.

Because it’s best to prevent dangerous situations from arising at all, the smart forfour has a whole host of innovative assistance systems to avoid accidents.

Fuel consumption (combined) 4.2 l/100 km,
CO2 emissions (combined) 97 g/kmThe figures stated were determined according to the prescribed measuring process, in this case the "NEDC CO2 figures" in accordance with Art. 2, no. 1 of Implementing Regulation (EU) 2017/1153. The fuel consumption figures were calculated on the basis of these figures. The fuel consumption was determined on the basis of Regulation 692/2008/EC. The data does not relate to an individual vehicle and does not form part of an offer, but are intended solely for the purpose of comparison between the different types of vehicles. The figures will vary according to the optional features selected. For further information on the official fuel consumption and official specific CO2 emissions of new cars, please refer to the "Guide to the fuel consumption and CO2 emissions of new cars", which is available free of charge at all points of sale and from Deutsche Automobil Treuhand GmbH at 

tridion safety cell.

smart forfour – tridion safety cell.

The heart of the innovative smart safety concept.

The tridion safety cell is made of high-tech steels and encases the passengers like the hard shell of a nut. Deformation is kept to a minimum in the event of an impact. In conjunction with the body the unmistakable iconic look is created.

Assistance systems.

smart – Crosswind Assist

Crosswind assist.

Crosswind assist is even able to compensate strong gusts of wind. When the esp® sensors sense the vehicle is at risk of leaving the lane they automatically initiate controlled brake intervention. The vehicle stays on course and the steering effort is greatly reduced.

Crosswind assist assists the driver in the event of sudden gusts of wind:

  • Course-correcting brake intervention via esp®
  • Much less drifting off track, resulting in noticeably lower steering effort
  • Enhanced safety and comfort for the driver
  • Activated from a speed of 80 km/h during straight-ahead driving and in slight bends,

Forward collision warning function with visual and audible warning.

The radar-based forward collision warning function can help to prevent rear-end collisions. If an insufficient safety distance is detected a warning lamp lights up in the instrument cluster. If the distance becomes critical with a risk of collision there is also an acoustic warning.

The driver assistance system warns the driver about the risk of a rear-end collision in two stages:

  • Stage 1: visual warning when a safety distance is not maintained but without an acute risk of collision
  • Stage 2: visual and acoustic warning when the distance becomes critical with an acute risk of collision
smart – forward collision warning

Crash sensor for activation of hazard warning lights.

When the airbags are triggered in an accident the crash sensor automatically activates the hazard warning lights. This enables vehicles behind to be warned in good time and subsequent collisions to be avoided.

abs – anti-lock braking system with electronic brake force distribution.

The anti-lock braking system prevents the wheels from blocking during emergency braking. The vehicle remains steerable and an obstacle can be avoided. Electronic brake-force distribution ensures the optimum distribution of braking forces between the front axle and the rear axle.

esp® – electronic stability programme.

esp® can prevent accidents caused by swerving. The system compares the vehicle’s behaviour with the driver’s intention, for example based on the position of the steering wheel. Split-second brake intervention on individual wheels and torque adjustment stabilise the vehicle.

Cruise control with limiter (variable speed limitation).

Cruise control enables you to set a cruising speed of your choice. In addition, a maximum speed can be set with the limiter. This offers additional comfort and safety when there are speed limits, for example in 30 km/h zones.

smart forfour – Lane Keeping Assist

Lane Keeping Assist with acoustic and visual warning.

Lane Keeping Assist is an attentive passenger that helps prevent you from leaving your lane unintentionally. A video camera scans road markings and detects differences in contrast between the road surface and boundary lines. An acoustic and a visual warning is given.

smart forfour – hill start assist

Hill start assist.

Hill start assist prevents the vehicle from rolling backwards when moving off on a hill. The system is part of esp® and maintains the brake pressure when the driver moves their foot from the brake pedal to the accelerator pedal.

Tyre pressure monitoring system.

If the value falls below a level relevant to safety, a warning lamp in the instrument cluster lights up. This automatically reduces the risk of breakdowns and accidents.

smart – tyre pressure monitoring system
smart – parking aid

Parking aid.

The rear parking aid facilitates manoeuvring and helps to avoid annoying damage. Three sensors in the rear bumper measure the distance to obstacles detected. The smaller the remaining distance, the shorter the intervals of the warning tone, culminating in a continuous tone sounds.

smart – reversing camera

Reversing camera.

The reversing camera makes reversing into a parking space easier and safer. It is switched on when reverse gear is engaged and shows the area behind the vehicle on the multi-touch display of the smart Media-System. Dynamic guide lines show the steering angle.


smart forfour – airbags

Airbags for driver and passenger.

The airbags for driver and passenger inflate like a protective layer and can prevent serious chest or head injuries. The air cushion inflates within milliseconds to protect the upper body and distribute the force applied to as large an area as possible.

In addition to airbags for driver and passenger, the smart forfour comes with a kneebag for the driver and two head/thorax bags in the driver and passenger seat backrests as standard.