US Patent 7714742 Wireless mesh network parking measurement system

A real-time parking activity measurement system comprising multiple, self-powered, mesh networked wireless vehicle sensors, a collection device, and a host computer. The wireless mesh network architecture allows the wireless vehicle sensors to be more reliable and to be more energy efficient by at least an order of magnitude compare to traditional wireless point-to-point and star-topology architectures. This architecture also enables the expansion of the measurement area without any additional infrastructure besides the necessary addition of wireless vehicle sensors.