Modern vehicles contain multiple interfaces -- connections between the vehicle and external networks -- that leave vehicle systems, including safety-critical systems, such as braking and steering, vulnerable to cyberattacks. Researchers have shown that these interfaces -- if not properly secured -- can be exploited through direct, physical access to a vehicle, as well as remotely through short-range and long-range wireless channels. This book addresses, among other things, available information about the key cybersecurity vulnerabilities in modern vehicles that could impact passenger safety; key practices and technologies, if any, available to mitigate vehicle cybersecurity vulnerabilities and the impacts of potential attacks; views of selected stakeholders on challenges they face related to vehicle cybersecurity and industry-led efforts to address vehicle cybersecurity; and Department of Transportation’s (DOT) efforts to address vehicle cybersecurity.