David Wood reports on the new scientific investigation unit for South Wales Police and Gwent Police forces, based in Bridgend.
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Almost £13,000 has been handed out in fines since tailgating became a punishable offence.
Early cloud and rain will spread westwards across all parts. However, it will become drier with brighter spells developing.
Any showers will ease through the evening to leave a mainly dry night with clear spells and light winds.