During Majid Rehman's trial, the court heard that he used his car to target six rail workers after having an argument at the taxi rank outside Cardiff Central station. He drove into the men, as well as two other passers-by on a pavement on Wood Street, close to the Millennium Stadium.
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There will be a fresher feel with temperatures falling lower than on recent nights.
The accident between junction 24, Coldra, and 23A, Magor, has closed the eastbound carriageway.
Eloise Parry, 21, died after taking diet pills containing the poisonous Dinitrophenol (DNP).