She described the vehicle as a “mini ambulance car” that is not marked, but still can use a blue light.
After three months the use of the vehicle will be reviewed to see if the number of cars needs to be increased.
The project is funded jointly by Cambridgeshire & Peterborough Integrated Care Board and EEAS which also serves Bedfordshire, Hertfordshire, Essex, Norfolk and Suffolk.
The EEAS has introduced similar initiatives in Suffolk, external, Norfolk , external& Essex and Hertfordshire, external in the last year.
Liz Ip Piang Siong, the ambulance service’s regional head of mental health, said she was “thrilled” to introduce a joint response vehicle.
She added: “Sadly during the winter months, we do typically see an increase in mental health-related 999 calls, so having this team on the road will allow us to provide the specialist support people need and avoid unnecessary journeys to hospital.”