Check the cleanliness of all the luggage trolley, check the umbrella par stock, check wheel chair 'status.

Busy professionals who travel to work by car may be able to take their hands off the wheel, sit back and check emails with autonomous vehicle technology being developed by UK researchers.

At the time of purchase, the user must check the slot size and a wire board tungsten steel precision, smoothness, especially with the line wheel and the arc part of roundness.