On non-urban roads, trucks may travel at 70 to 80 km/h depending on the vehicle and signage.

Trucks may not exceed 90 km/h on Portuguese motorways due to braking distance and weight.

School zones enforce a 30 km/h limit to protect children during entry and exit times.

Industrial areas require reduced speed due to workers, forklifts, and heavy equipment movement.

In the absence of signage, 30 to 40 km/h is the typical enforced limit in industrial environments.

Heavy rain reduces traction and visibility, requiring lower speeds for safety.

Heavy loads affect braking and control; reducing speed ensures safe handling.

Visibility drops in fog, so speed must be lowered and lights turned on.

Ice makes roads slippery, so trucks must drive well below normal speed to avoid skidding.

Slowing down ensures trucks can stop if pedestrians appear unexpectedly.

Reducing speed and using engine braking prevents overheating and improves control.

Trucks must slow before entering to yield and navigate safely.

Gravel surfaces are unstable and require slower speeds to maintain balance and traction.

Wet roads increase stopping distance; slowing ensures child safety.

Strong winds can destabilize trucks, so reducing speed improves stability.

Dangerous cargo must be transported at lower speeds to reduce accident risk.

Narrow roads require trucks to slow down to avoid collisions and maintain control.

Poor lighting requires trucks to slow to detect and respond to hazards early.

Low speeds protect children who may run into the road unexpectedly.

Lower speed ensures safety of cargo and reduces damage to the truck.

Even on highways, trucks must lower speed in rain to maintain traction and visibility.

Slowing down ensures safe navigation in narrow, pedestrian-heavy boarding zones.

High foot traffic requires very low speeds to avoid collisions.

Trucks must slow significantly to safely exit industrial areas with forklifts and tight exits.