Keller's on Northwest Highway in Dallas has been called the best drive-in hamburger joint in the USA by many. Maybe that's true and maybe not. I can't say because I've not been to all of them, but it is unique, you will not be disappointed and it enjoys scads of very loyal patrons. It hasn't changed in the 50 years we've been going there, and fortunately we've always lived within a stone's throw of the place. Two people can get a hamburger each, a generous order of fries each and a cup of H20 each for $9.60...and what I do is hand over $15 and say "keep the change, love" because these ladies work hard. Here are about 500 photos. There will be an old Vette in there, a 56 Bel-Air, a couple of old pickups, hot rods, T-Birds, etc. And the hamburgers really do look like this...
https://www.yelp.com/biz_photos/kellers-drive-in-dallas?start=120And another opinion:
https://www.thrillist.com/eat/dallas/kellers-drive-in-review-drive-in-restaurantsand another:
https://cravedfw.com/2021/03/04/kellers-drive-in-still-hopping-after-67-years/Most of these writers are going to tell you to get the number 5 special, but I always just get the regular hamburger with everything on it.