what about those big white spots or squares painted across the carriageway of a motorway? - I've always assumed they're something to do with rights of way.
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They are so the police can time you between two certain points and do you for speeding.
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Its called Vascaa or something.
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...so the route can be traced from the air. Often associated with airports / military airbases.
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There is/was a load of these posts round here where a huge pipeline 150kms long was buried. ISTR it is for visual observation from the air for before, during and after aerial photography for compensation payments for lost crops and the like.
Martin
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