Service Station and Motel

There's an abandoned car still running at the service station. Is anyone here?
Is there any way I can get into the station's office?
Do I need to solve the jigsaw puzzle on the counter near the office door?
How can I turn the cafe's kitchen lights on?

How can I enter any of the motel rooms?
How can I open the briefcase in room 3?
Can I ever get anything from the vending machine next to the motel?

How can I get into the Barrow Hill Motors building?
Once I'm inside Barrow Hill Motors, how can I get back out?

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