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This happens when police officials stop cars in a structured sequence in order to check for signs of impairment.
The paragraph is talking about sobriety check points.
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Explanation: Supongo que se trata de una errata y se refiere a Traffic safety. En España cuando se refiere a la seguridad del tráfico lo llamamos "seguridad vial". Otra opción sería seguridad y tránsito.