The rush-hour incidents took place within 40 minutes of each other and less than six miles apart in the north Glasgow area yesterday.
The first incident was a head-on crash involving two cars at about 8.30am on Baljaffray Road in Bearsden, East Dunbartonshire, the Scottish Fire and Rescue Service said.
Firefighters called to the scene stabilised the motorists and removed them from the vehicles.
The man and woman were then transferred by ambulance to the Western Infirmary in Glasgow.
Five people were taken to hospital following the second incident, a collision between a car and a minibus which happened just before 8.50am on Queen Margaret Drive in the Kelvinside area of Glasgow.
Two of the adults and the two children were in the minibus while the other adult was in the car.
The third collision involved two cars and happened just after 9am on Grampian Way in Bearsden.
Firefighters and ambulance crews treated a woman and a man at the scene.