American multinational retail corporation Walmart filed a patent application in March 2016 for a system which allows shopping trolleys to drive themselves and assist customers with their shopping in store.  The patent was published by the US Patent and Trademark Office (USPTO) on 8 September 2016.

The shopping trolleys will be fitted with a camera, sensors and a detachable motor.  According to the patent application an available shopping trolley can be called to a customer, navigate the store using its sensors and abandoned trolleys will be able to return to the docking station.