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5 <br /> collisions suddenly prevents any of the messages from getting through at all and the <br /> system locks up. It continues to be locked up until all the mobile units have finished all <br /> their retransmissions and rovided a message to their vehicle operator that the <br /> 9 P e <br /> message could not be transmitted. At that point the system clears itself and persons <br /> with mobile terminals are able to transmit messages, and eventually collisions occur <br /> which causes retransmissions, which causes even more collisions - and the system <br /> locks up again for awhile. This is a common occurrence in afternoon and evening <br /> hours, especially during summer months, in the Anoka County data communication <br /> system. It essentially destroys much of the value of the mobile data communication <br /> system, as persons must then resort to use of voice traffic, which is also very <br /> congested, in order to transmit information that could otherwise be transmitted in digital <br /> form. <br /> The existing Anoka County mobile data communication system is not able to transmit <br /> additional information, for example, the transmission of reports. <br /> III <br />