It was to streamline the designs for European sales. In Germany, You flash to pass. For instance on the autobahn, the faster car has right of way in the fast lane. When they top the hill, they flash their headlights to tell the people ahead "to move over I'm coming through." This is why cars now have the 3rd head light postion that springs back when you pull the signal to you. You would wear out a switch if you had to click it everytime.
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