Basically, everyone meets up for lunch at a restaurant in some location. After an hour or two, we group into cars, generally about 3-4 people per car, and follow a tour route set out by the meet host that takes us through the most interesting places in the area (e.g. bridges, scenic routes, interesting signage or interchanges, new construction, etc.). Along the way, there are generally 3-5 stops where everyone recongregates and people can take pictures from outside the car. At the end, we wind up back at the restaurant so that people can return to their own vehicles to head out. As Steve said, sometimes there's dinner afterwards for people who are available to stay.