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The VISSUM and VISSIM simulation models are setup according to the real road network of Park City, Utah, U.S. The OD matrix is calibrated by the field turning counts. The effects of in-trip real-time information on traffic improvement are studied through microsimulation. Tests have shown that under adaptive traffic control signal, the in-trip real time information has negative feedback effect, and the traffic flows become stable. The information distribution parameters including frequency, delay and proportion of drivers using the information exhibits a window effect. Within the widows, total travel time decreases more than 10%, and total delay decreases more than 20%. The conclusion is that by carefully selecting the distribution parameters of real-time information, the traffic situation of this road network could be improved.

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