How does a trolley bloking system work (in a market)? how come it blocks a wheel when in a certain distance?



Answers:
it has a censor when you pass it it blocks the wheel that also has a reciver to discharge the break.
What like you mean when its still in the supermarket?
The systems crap the pound thing was better. the brake thing came down on my full trolley by the entrance and I had to drag it to the car whilst it made this evil scratching noise. so very embarrassing.
The levels of grammar, spelling and punctuation in this question, and the answers so far, are some of the worst I have seen in Yahoo Answers. Illiteracy gone mad.
it means you can't take it to the nearest canal and dump it.

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