In 2008, tire pressure monitoring systems became required for cars sold in the U.S. Some cars had systems which measured the number of rotations of the wheel. If one tire was flat and rotated differently, it would activate a warning. I like this. I don't like the required system which measures the pressure of each tire and sends a wireless signal to the car.

Wireless Car Sensors Vulnerable to Hackers - Technology Review

Hackers could "hijack" the wireless pressure sensors built into many cars' tires, researchers have found. Criminals might then track a vehicle or force its electronic control system to malfunction, the University of South Carolina and Rutgers University researchers say....Earlier this year, researchers from the University of Washington and the University of California, San Diego showed that they could take over the control systems of a popular model of automobile, causing the brakes to lock or the engine to cut out.