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Field measurements were made of vehicle to roadside communication performance at two roadside dedicated short range communication sites in San Francisco. Portable equipment allowing the recording of data gathered from multiple radios on a single vehicle used the wireless access in a vehicular environment radio modules produced by Denso according to the specifications of the crash avoidance metrics program's vehicle safety communications consortium. Software was developed at the application layer to generate artificial loading in order to emulate with one or a few vehicles some of the characteristics of systems with many more vehicles. Experiments were carried out to emulate transaction processing on the service channel and investigate performance in an urban setting.