School children from Millbank Primary School in Ely have helped to launch a new law that aims to make walking and cycling in Wales safer.
The Active Travel Bill puts a duty on local authorities to improve conditions for cyclists and pedestrians.
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The heaviest bursts are expected in the south and east, with some western areas either remaining dry or becoming dry by dawn.
Many places will start dry, but rain in the southeast will spread to most for a time overnight.
The family of Isaac Nash who went missing after being swept out to sea last summer have presented a cheque for £10,000 to the RNLI.