A sensor system detects any items dropped on the ground near a vehicle using a lidar or other sensor. A sensor system takes a reference scan, or other data collection, of the ground before a passenger enters or exits the vehicle. The system takes a comparative scan, or other data collection, shortly after the passenger has entered or exited the vehicle. If a change is detected by the system, an alert could be activated.
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Dowdal, Jonathan and Zhu, Jiajun, "Detection of a Vehicle Occupant’s Dropped Items After Vehicle Entry or Exit", Technical Disclosure Commons, (May 04, 2015)