There's one lane closed between Junction 16 (A3102 / B4005 Swindon West) and Junction 17 (A350 / A429 / B4122 Chippenham) due to a broken down lorry.
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The dad of Luke Jenkins, who died at Bristol Royal Hospital's children's cardiac unit labelled an NHS England review a 'tick-box exercise'.
It's a cloudy offering with drizzle in places today - although some maybe lucky and escape.
The cardiac service at Bristol Children's Hospital was blighted by understaffing and poor communication, according to a review out today.