See also:

AM radio reception
AM signals, because of their low frequency, can bend around objects and skip along the ground. In addition, the signals can be bounced off the ionosphere and bent back to earth. Because of thes ...

Uniform tire quality grading
DOT (Department of Transportation) Quality Grades: All passenger car tires must conform to federal safety requirements in addition to these grades. Quality grades can be found where applicable ...

Automatic door locks
- All doors lock automatically when the vehicle speed reaches 15 MPH (24 km/h). - All doors unlock automatically when the ignition switch is placed in the OFF position. The automatic unlock func ...