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A Mobile Speed Camera. A talivan is a speed camera inside a police van, so that it can be moved from place to place, such as motorways or straight A-roads. They are revenue raising instruments that cause accidents (rather than prevent them as the operators claim)
That 'Davies Builders' van has parked right up against the talivan, so they've driven off in annoyance...
by Wattsie April 24, 2006
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The vehicle (van) that terrorist were driving and riding in during the first Back to the Future.
Marty noticed the Talivan and became hysterical with anxiety, but Doc Brown was wearing a bulletproof vest remembering what Marty had told him while they were in the past.
by VonDutchMedic November 26, 2017
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