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Yup (or at least, some reason could always be found). But they don't shoot you as much. So it's swings and roundabouts really.

Yup. In the UK police can also stop and search you at their liberty.

Airstrip One.

They have to have probable cause, but like in most other countries they'll just make something up like they smell drugs or whatever

In the UK they don't have to have probable cause.

Pedal bikes aren't allowed on the motorways in the UK, so I assume this falls under some similar sort of rule.

Edit: never mind; I should read my sources.