NEW YORK — Grab your sunglasses, a giant cup of coffee and prepare to hit the highway: 2016 is shaping up to be the summer of the road trip.Cheap fuel prices have left many American families flush with spare cash, which they now plan to spend on vacations. And with summertime gas prices predicted to be the lowest in 13 years, the travel industry is looking forward to a blockbuster July and August.“We’re pretty excited,” said Steve Joyce, CEO of Choice Hotels, which includes Comfort Inn and Econo …