• Teen driver identification subsystem (TDIS);
• Seat belt detection and enhanced reminder subsystem (SBDRS);
• Passenger presence subsystem (PPS);
• Speed monitoring and feedback subsystem (SMFS);
• Excessive maneuver and feedback subsystem (EMFS);
• Cell phone use detection and mitigation subsystem (CDMS); and
• Driving context subsystem (DCS).
One significant feature of the STC system is that it is adaptive, in the sense that the criteria for
operation of some of the subsystems depended in part on the status of other subsystems. For
example, the threshold for triggering a stronger speeding warning was influenced by the use of seat
belts, the number of vehicle occupants and whether there were nighttime driving conditions. In this
sense, the system became less tolerant of a given degree of deviation from ideal behavior when it
sensed other improper behaviors or risk factors.