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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The high street chemist - which charges almost £15 more for the pill than rivals - said it was "truly sorry" for a "poor choice of words".
A 31-year-old man has been missing since yesterday morning.
A festival will take place this weekend to pay tribute to Christina Edkins, who was killed on a bus in 2013.