Flooded roads and driving through water
Flooded roads hide deep holes, loose manhole covers and strong currents. Turning around is usually the safest choice, yet you may still meet standing water in dips or underpasses. Plan ahead and prepare the vehicle to avoid engine damage and dangerous rescues.
Before you approach the water
| Checkpoint | Why it matters | Action |
|---|---|---|
| Water depth | 30 cm can float a car, 45 cm can sweep away an SUV | Use roadside markers, signs and fixed objects for reference |
| Flow direction | Strong current shifts the vehicle | Trace the possible exit path and decide if the car could float |
| Road surface | Asphalt may be undermined | Gather updates via Norwegian Public Roads Administration services |
| Alternative routes | Often faster and safer | Follow diversion signs and map apps |
When to turn back
- Water reaches the centre of the wheels or higher
- Edge lines or kerb are no longer visible
- The current carries branches, foam or stones
- You smell fuel or see electrical cables in the water
Remember: The engine air intake is lower than you expect. Ingested water destroys the engine within seconds.
If passage is unavoidable
| Step | What to do |
|---|---|
| 1 | Select a low gear and keep steady throttle to minimise bow waves |
| 2 | Hold a straight line; avoid gear changes and stopping |
| 3 | Test the brakes gently afterwards to dry the pads |
| 4 | Inspect engine bay, bearings and lights once you are safe |
Read Driving in difficult conditions and Aquaplaning and heavy rain for stability techniques.
Emergency kit
- Carry hazard lights, a head torch and dry clothing. See Emergency equipment in the car .
- Use Roof load and roof boxes to keep essential gear dry, while respecting weight limits.
- Update contact details in warning systems such as Digital driving licence to receive road-closure alerts.
- On long trips, share your itinerary and consider satellite messaging where mobile coverage is poor.
After the flood event
| Inspection | Why |
|---|---|
| Tyres and wheels | Stones and debris can puncture or deform rims |
| Brakes | Moisture and rust reduce efficiency |
| Engine oil and gearbox | Water contamination damages components |
| Electronics | Sensors and connectors need to dry |
Stop the trip if you notice vibrations, warning lights or unusual noises. Disconnect trailers that have been submerged and check lights, brakes and coupling in line with Securing load and passengers .
Key takeaway
Turning around is the best choice when facing floodwater. Match risk assessment with sound driving technique and preparedness, obey local instructions and put safety ahead of progress.