A vehicle comprising: an advanced driver-assistance system (ADAS) that selectively performs, and selectively stops performing, automated vehicle navigation operations; a steering wheel with which a human driver steers the vehicle when the automated vehicle navigation operations are not performed; a sensor (414, 100, 200, 300, 440) operable to detect a driver's hand at a plurality of locations on said steering wheel; a plurality of visible-light emitters (106 - 109) operable to illuminate the plurality of locations on said steering wheel; and a processor (441 - 443), coupled with said ADAS, with said sensor and with said visible-light emitters, performing the following functions while said ADAS is performing the automated vehicle navigation operations: (i) an activating function that activates at least one of said emitters to illuminate a location on said steering wheel, (ii) a detecting function that detects, via said sensor, when the driver touches the illuminated location, and (iii) a calculating function that calculates a degree of driver preparedness for taking control of steering the vehicle when said ADAS stops performing the automated vehicle navigation operations, based on at least one of time elapsed between the activating function and the detecting function, and proximity of the driver touch to the illuminated location. an advanced driver-assistance system (ADAS) that selectively performs, and selectively stops performing, automated vehicle navigation operations; a steering wheel with which a human driver steers the vehicle when the automated vehicle navigation operations are not performed; a sensor (414, 100, 200, 300, 440) operable to detect a driver's hand at a plurality of locations on said steering wheel; a plurality of visible-light emitters (106 - 109) operable to illuminate the plurality of locations on said steering wheel; and a processor (441 - 443), coupled with said ADAS, with said sensor and with said visible-light emitters, performing the following functions while said ADAS is performing the automated vehicle navigation operations: (i) an activating function that activates at least one of said emitters to illuminate a location on said steering wheel, (ii) a detecting function that detects, via said sensor, when the driver touches the illuminated location, and (iii) a calculating function that calculates a degree of driver preparedness for taking control of steering the vehicle when said ADAS stops performing the automated vehicle navigation operations, based on at least one of time elapsed between the activating function and the detecting function, and proximity of the driver touch to the illuminated location. (i) an activating function that activates at least one of said emitters to illuminate a location on said steering wheel, (ii) a detecting function that detects, via said sensor, when the driver touches the illuminated location, and (iii) a calculating function that calculates a degree of driver preparedness for taking control of steering the vehicle when said ADAS stops performing the automated vehicle navigation operations, based on at least one of time elapsed between the activating function and the detecting function, and proximity of the driver touch to the illuminated location.