Florida fuel/service centers are ambidirectional. One center serves traffic in both directions.
Southern Florida may be unique in how it situates its highway traffic service centres. They’re plopped between the highways which go in the two different directions. Therefore, traffic in either direction is serviced by the same, single service centre.
One might think, ahh, American efficiency and capitalism at its best. After all, back home in Canada, we build service centres on both sides of the highway to service the traffic going in one direction. Two service centres, double the building costs, expense doubled from the get go!
But on closer examination, the American centres are huge, double the one side of the highway size. So any financial gains are lost because the centres have larger restaurants, bigger washroom facilities, and a greater variety of retailers catering to highway users.
It looks good on paper though!