BMW's sales and marketing head says carmakers are coming under pressure from technology and advertising companies to share data collected by connected cars.

Ian Robertson told the Financial Times during the Detroit Motor Show that non automotive companies are saying "give us all the data you've got and we can tell you what we can do with it" but BMW's response is "No thank you."

In-car technology such as GPS sat-nav and telematics are now able to yield information about the location, speed, driving characterics and even the occupants of the car - identifying for example if a child is on board by sensors within the seat linked to the airbag system.

BMW said it had a firewall in place to protect crucial data about the internal running of the car.

For the full Financial Times article click here.

Click here for a gallery of cars at the 2015 Detroit Motor Show.