What must you reckon with when it starts raining after a long period of dry weather?

When it starts raining after a long dry spell, two main hazards arise: the formation of a dangerous greasy film on the road, and quickly reduced visibility.

The greasy film is created when rain mixes with accumulated dirt and oil on the road surface. This can significantly reduce traction, increasing the risk of skidding. It is crucial for drivers to adjust their driving behavior, such as slowing down, to account for this hazardous condition.

Bad visibility can occur due to raindrops on the windscreen when the wipers are activated, especially if the windshield is dirty or if the wipers aren't functioning properly. This makes it vital for drivers to ensure their wipers are in good condition and to clean their windscreen to maintain visibility.

While shorter braking distances might seem relevant, they do not apply to this situation. In fact, braking distances can actually increase due to the greasy surface and reduced traction. Therefore, recognizing the correct combination of hazards is vital for safe driving in rainy conditions, as outlined in German traffic regulations, to help prevent accidents and enhance road safety.