Forget the summer solstice. This weekend -- Memorial Day -- marks the unofficial start of the season in the U.S. And all signs point to it being a good one. Gasoline prices are at the lowest level for this time of year since 2005, spurring more travel and road trips over the three-day break. More than 38 million Americans will travel over the Memorial Day weekend, according to AAA, with about 90 percent going by car.

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