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Fourteen months after being marketed to businesses and five months after sales to individuals commenced, the Transporter remains more of a novelty than the revolutionary transportation device trumpeted by tech industry luminaries and others. You can usually spot one being demonstrated at an amusement park, or your postal carrier may be testing one, but city streets and factory floors are practically devoid of the gizmos. The device has a top speed of 12.5 miles per hour, up to three to four times the average walking pace.