Councils will be given greater freedom to introduce 20mph schemes under new government proposals to improve road safety.
Local officials will also have more scope to cut speeds on rural roads with a history of accidents and introduce variable speed limits outside schools as part of the updated Department for Transport guidance.
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Dr Michio Hirano denied having any financial interest in the experimental treatment considered for the baby.
The measures are set to be included in a court-mandated clean air strategy the Government is due to publish on Wednesday.
Low pressure in the Atlantic brings a spell of wet and windy weather on Wednesday.