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In page Road-powered electric vehicle:

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A parking area with an overhead electrical net was in use at Seoul Grand Park Zoo in South Korea, to recharge electric vehicles[citation needed], This was similar to a fairground bumper car arrangement which allowed vehicle batteries to be recharged, prior to introduction of the more modern OLEV Online Electric Vehicle system. The advantage was that vehicles could be parked randomly, as convenient, and there was no need for either the tripping hazard of trailing cables used by most electric vehicles nor for fiddly precise alignment of conductor poles needed by trolley buses.