structural parts for vehicles, namely, electromechanical systems for preventing accidents involving vehicles including accidents between two or more vehicles, accidents between a vehicle and an inanimate object other than another vehicle, accidents between a vehicle and an animate object, accidents in which a vehicle deviates from a roadway, accidents caused by driving and road conditions, said systems consisting primarily of transmitters, receivers, microprocessors, software and electrical architecture all optionally interacting with global positioning system satellite or ground-based technology; electromechanical systems for determining the presence, location and/or velocity of vehicles utilizing radar, lidar, optical and/or infrared imaging, said systems consisting primarily of transmitters, receivers, microprocessors, software and electrical architecture all optionally interacting with global positioning system satellite or ground-based technology; electromechanical systems for determining the position of a vehicle involving vehicular-mounted, satellite-based positioning systems and/or ground-based transmission towers, said systems consisting primarily of transmitters, receivers, microprocessors, software and electrical architecture all interacting with global positioning system satellite or ground-based technology; electromechanical vehicular guidance systems for guiding a vehicle along a roadway, in traffic, out of a traffic stream to a shoulder of the roadway, exit or other location and in accordance with a map, said systems consisting primarily of transmitters, receivers, microprocessors, data storage devices containing map data, software and electrical architecture all optionally interacting with global positioning system satellite or ground-based technology; automatic vehicular steering systems consisting primarily of transmitters, receivers, microprocessors, actuators, software and electrical architecture all optionally interacting with global positioning system satellite or ground-based technology; electromechanical systems for determining an absolute and/or relative position of edges and lane boundaries of a roadway such as relative to a vehicle, said systems consisting primarily of transmitters, receivers, microprocessors, software and electrical architecture all optionally interacting with global positioning system satellite or ground-based technology; electromechanical systems for controlling travel of a vehicle on a roadway, namely, automatic cruise control systems for automatically controlling travel of a vehicle on a roadway, namely, automatic cruise control systems for automatically controlling travel of a vehicle on a roadway at a set speed and braking of a vehicle, said systems consisting primarily of transmitters, receivers, microprocessors, actuators, software and electrical architecture all optionally interacting with global positioning system satellite or ground-based technology; electromechanical systems for enabling communication between vehicles, primarily of data relating to position of one or more of the vehicles and accuracy thereof and/or velocity of one or more of the vehicles, said systems consisting primarily of transmitters, receivers, microprocessors, software and electrical architecture all optionally interacting with global positioning system satellite or ground-based technology; electromechanical systems for enabling communication between a vehicle and a source of maps and data on weather and road conditions to direct movement of the vehicle and to prevent accidents involving the vehicle, said systems consisting primarily of transmitters, receivers, microprocessors, software, a visual display screen or speaker, and electrical architecture all optionally interacting with global positioning system satellite or ground-based technology