Here in the UK we have service stations on the motorways, some are situated just off the junctions (exits to you) that're there anyway and others have their own exits. Outside of cities there's usually a fairly long distance between junctions, so there's plenty of room for them.
Most service stations consist of a couple of large (free, up to 4 or 5 hours) car parks (one for cars and one for HGVs and coaches), a petrol (gas) station and a large central building. This building typically contains toilets, a couple of fast food outlets, a self-service restaurant, maybe a coffee shop, maybe an arcade, and an overpriced shop selling magazines, sweets, drinks, a few toiletries, maps and assorted junk. Some service stations also have a travelodge/chain hotel attached.
Generally where there's a service station on one side of the motorway there is one on the other (eg Reading West and Reading East on either side of the M4).
I don't know who owns this land, but it seems likely to me that it's owned by the government and rented by the services management chains (Moto, Welcome Break and Roadchef), although they might own them themselves. Needs a bit of investigation.

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