| 摘要 |
Embodiments of the present invention relate to a method of determining speed information, comprising receiving traffic monitoring information navigation devices (610), wherein the traffic monitoring information includes identification information identifying a mobile device (630), location information indicating a geographic locations (910, 920) at which the identification information was received from the mobile device (630), and temporal information indicating times at which the identification information was received, and determining speed information associated with the mobile device from the traffic monitoring information.
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