Up to 40cm (15 inches) of snow was expected later on Friday in Germany, with heavy winds expected to bring traffic to a standstill.
Airports have called in extra staff and rail operators have warned of delays.
In the UK, the worst winter for decades has led to a fear for energy supplies as temperatures dropped to -22C (-8F).
"What is being forecast for the weekend could lead to chaotic traffic conditions and potentially leave large parts of Germany completely paralysed," warned the Auto Club Europa. Read more.