Bethel's Sycamore Drive-In hasn't been owned by the same folks since it first opened, but it has been run continually since 1948. And the original owners did hand down recipes for the joint's "French-style" steakburgers and homemade root beer.
As for curb service, you just pull in and park, turn on and flash your lights, and a carhop will come right up to your car to take your order. The Sycamore's "final answer to the burger" is their Dagwood Burger: five ouces of ground steak, a slice of American cheese, mustard, ketchup, picklse, onions, tomato slices, lettuce, and mayo. If that's not enough, you can top it with extras like chili, fried onions and peppers.