Julie Townsend, the head of road safety charity Brake, said she supports the targeting of younger drivers in their early 20s and morning-after drivers.
She said that many people do not realise the risks of driving after even one small drink.
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Rain slowly clearing to sunshine and showers on Sunday.
Outbreaks of rain will move southwards turning clearer and colder.
Heavy showers with a chance of thunder but clearing this evening with clear spells overnight.