Roof load and roof box can be practical, but affects both the car’s aerodynamics, center of gravity and braking weight. Correct mounting and moderate speed are crucial for safety.
Weight limits and placement
| Component | Typical limit | Tips |
|---|---|---|
| Total roof load | 50–75 kg | See car’s registration document and manufacturer’s roof load limit |
| Roof rack | Follow manufacturer | Check screws before each trip |
| Roof box | Follow manufacturer | Distribute weight evenly, heavy items low and center |
Related rules: Weight concepts for passenger cars and Rules for tires and chains.
Securing and load securing
- Use straps through attachment points in the roof box
- Secure loose items to avoid shifting during braking
- Check locks and opening before driving and after breaks
See also Securing loads and passengers.
Impact on driving characteristics
| Condition | Effect | Action |
|---|---|---|
| Higher center of gravity | More body roll in curves | Reduce speed in curves, gentle steering inputs |
| Increased air resistance | Higher consumption and noise | Reduce speed, consider removing box when not in use |
| Wind sensitivity | Crosswind affects course | Maintain good distance, consider at tunnel exits and bridges |
For more about wind effects, see Crosswind and gusts.
Recommended driving pattern
- Reduce speed, especially over 80 km/h
- Increase following distance and brake earlier
- Avoid sudden evasive maneuvers and lane changes
- Check attachments regularly on long trips
Checklist before departure
- Roof rack correctly mounted and tightened
- Box/straps correctly attached and locked
- Load distributed and secured against movement
- Tire pressure adjusted for load, see Tires and maintenance
Summary
Roof load and roof box require precise weight handling, solid attachment and adjusted driving style. By reducing speed, increasing distance and securing the load properly, you drive safer and more predictably.