求翻译：　　It began early in the morning, all his luggage in the back of the ambulance and the motorway in Germany looking reasonably clear. Soon, as always, a long line of traffic appeared ahead. He switched on the flashing light and set off the siren. Cars swiftly slowed and felled off the fast lane. Other cars stopped and drivers waved him ahead to an open road all his own. In record time he crossed the border into Austria. The big bluff was working. Police even waved him through the confusion caused by an accident.是什么意思？

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