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Amsterdam and Copenhagen are generally safer for bikers than the U.S. because high car taxes and gasoline prices tend to keep sport-utility vehicles off the road. In Denmark, the tax for buying a new car is as high as 180%. Drivers must be over 18 to get a license, and the tests are so hard that most people fail the first few times. Both cities have worked to train truck drivers to look out for bikers when they turn right at intersections, and changed mirrors on vehicles and at traffic corners so they're positioned for viewing cyclists.