A pregnant South Australian mum was forced to give birth on the side of the road.

Bianca Grant was being driven to Adelaide’s Women’s and Children’s Hospital by her husband, Stephen Curran when they hit heavy traffic.

"Bianca was telling me to go round the cars, the ambulance on the phone told me to stay put," Mr Curran told The Adelaide Advertiser

"In the end, I just had to deal with it".

He was forced to pull over to help his wife deliver the baby.