A flashing device fitted to a pole near passport control units in airports, land border crossings, and sea ports, which halts illegal human traffic.
Implemented by government agencies, such as the UK Home Office, as a result of national immigration policy.
The large articulated lorry, with a container full of illegal north Korean immigrant labour, was forced to wait at some human traffic lights at Dover passport control when they showed red.
Prices shown in USD.
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