Modern cars quietly collect and share location and identity data, which is bad news for anyone who assumed driving was private.

• Newer cars are packed with connected computers — even tire pressure sensors send data out.
• Sensors placed on highways and in subways pick up the Bluetooth and Wi-Fi signals from cars, phones, and headphones.
• Those signals form a unique "fingerprint," so trackers can tell who is in a car, not just who owns it.
• Some carmakers were caught selling customer location data to insurance companies.
• At least one data broker tracks immigration status alongside the rest.

Outlook: Expect more lawsuits and pressure on carmakers over data selling, but little change in how much cars collect.