Roof box precautions Smart FORFOUR ?

The position of the roof box for Smart FORFOUR must be centered on the roof to ensure proper balance of the vehicle. For your own safety and that of others, be sure to check the fastenings every time you stop. Especially as improper securing can result in the unpleasant (and always unpleasant, especially on vacation...) penalty of a 68 euro fine imposed by the police.

The presence of a filled roof box Smart FORFOUR alters the balance of the vehicle (i.e., a mass of up to 50kg, positioned high up). According to certain operating instructions, it is preferable not to exceed 110km/h and generally to reduce your usual speed by 10 to 20km/h, especially when cornering. Drive at walking pace over speed bumps. And watch out for wind resistance in strong winds.

As the aerodynamics of your Smart FORFOUR decrease with the roof box (empty or not), don't be surprised by an extra fuel consumption of at least 10%. Don't hesitate to drive slower to reduce fuel consumption. And that's why we advise you to remove the roof box Smart FORFOUR once it's been emptied (e.g. at your destination), to save fuel.

Another important point: the overall height of your Smart FORFOUR increases with a roof box and can exceed 2 meters, in which case think about choosing a toll box with no height limit. Be careful in parking lots, tunnels and especially in car washes (without the roof box please, otherwise it's a massacre !).

Finally, there are no official regulations specifically governing the use of roof boxes. However, article R312-19 of the French Highway Code states that "all necessary precautions must be taken to ensure that the loading of a vehicle does not cause damage or danger".