A Hampshire woman gave birth of the side of the motorway after the police stopped her 100mph dad as he drove her to hospital.
Tiffany Ellmore on the M275 motorway at 10.15pm on Friday evening after the police pursuit.
Four unmarked police vehicles surrounded the family car as the baby's head started to appear, in which Tiffany's dad Colin delivered the baby.
The officers present phoned an ambulance which took mother and baby to Queen Alexandra Hospital in Cosham, Portsmouth.
Tiffany, who has three other children, was 38-weeks pregnant and had started having contractions around 4pm.
Baby Lola Mia Rose weighed a healthy 6lb 4oz and was discharged home on Saturday.
Police said no action would be taken over the M275 drama.
More top news
A damp and cold night ahead. Valentine's Day will start cloudy but become brighter in the afternoon. Risk of showers along the Kent coast.
Cold and damp tonight with outbreaks of rain. A cold and dull start to Valentine's Day but becoming drier and brighter by the afternoon.
Rain turning more patchy this afternoon but more persistent along the coast. Feeling cold in the brisk north-easterly wind.