Why are they warning owners to not drive their own vehicles?

Ford and Mazda Issue ‘Do Not Drive’ Warnings for 475,000 Vehicles  

Ford and Mazda have issued “do not drive” warnings for 475,000 vehicles that contain recalled Takata airbags.Car Auto Sticker by Toyota Deutschland

More than 374,000 model years 2004 to 2014 Fords have been recalled along with more than 82,000 model years 2003 to 2015 Mazdas.

At least 27 people have been killed and hundreds more injured by defective Takata airbags.

To see if your vehicle is affected, please go to http://Ford.com/Support/Recalls/

Do not drive your recalled vehicle until it can be fixed for free at an official dealership.

https://www.ford.com/support/recalls/

https://www.mazdarecallinfo.com/