&gt; How about &quot;No seatbelt, no car move&quot;.<p>I like the concept but what if the sensor fails? Suddenly you&#x27;re stuck who knows where...<p>I believe Chevrolet  has a &quot;teenage driver mode&quot; which allows you to disable the radio, AC, and for it to bug you if you drive without a seat belt. I like that concept far more since it doesn&#x27;t leave you stranded because the seat belt failed to be detected. It also allows you to set a maximum speed, a maximum radio volume, and for parents to get a report later if they wish.<p>I never drive without a seat belt. I just don&#x27;t want to add more points of failure to a car than it absolutely needs.