As auto manufacturers imagine a future of self-driving and always-connected cars, they'll need to worry about something else-electronic malfunctions and cyberattacks, according to a report released by the Transportation Research Board. "Automobiles today are literally 'computers on wheels,'" says the report. Current auto software uses more than a million lines of code. In the coming years, onboard computers will become even more important. Like a computer, a car's internal software can be infected with a virus or hacked. Last year, researchers at the University of Washington and the University of California, San Diego, proved that computers could be hacked with either physical access to the car or wirelessly using technology such as Bluetooth. A hacker could then disable the brakes, stop the engine, or worse. According to the report, "automotive manufacturers have designed their networks without giving sufficient attention to such cybersecurity vulnerabilities because automobiles have not faced adversarial pressures."