That annoying low-tire-pressure light could also be an intruder alert. Hackers have found another way into your car's computer system: where the rubber meets the road. Thanks to the TREAD Act, every new car since 2008 comes with a tire pressure monitoring system. It's what turns on that annoying low-pressure light we're all familiar with. By monitoring the the air pressure of each tire and alerting the driver when the pressure falls below a certain threshold, you car's TPMS makes you safer. It also makes you a bigger target for hackers. The problem is that TPMS uses unencrypted radio frequencies...