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What are these things? (Not datum plates)

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Skoodle

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0817f7a5-9a9b-4943-b116-efca3ea9c5a8.jpg

Currently seen during engineering works around Catford. Does anyone know what they are or what they're used for?
 
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Skoodle

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My friend who asked me said they were flashing for a time, so lights could be an option, but why have them flashing?
 
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