Memorial Day is just around the corner, and that means Americans will hit the roads, airports and trains in droves. Some 34.9 million traveled to mark the start of summer in 2011, according to AAA.

While many will travel to the beach -- the Long Island Expressway is one of the most highly trafficked roads in America that weekend -- many will head to the airport.

Foursquare put together a compendium of what will be our nation's busiest airports, train stations and highways come next weekend, based on where 20 million checked in the most on Memorial Day 2011.