The first phase of the TravTek IVHS experiment will involve the use of in-vehicle Route Guidance Systems (RGS) to determine the best routes through the Greater Orlando Area. These routes will be computed in a distributive fashion based on minute-to-minute travel time updates Center (TMC). This paper describes the most important traffic engineering aspects of the data fusion, dissemination, and in-vehicle processing of the TravTek system with the intent of demonstrating how the features of each of these steps can be modelled within the TravTek version of the INTEGRATION traffic simulation model. The simulation of these system features is initially intended to assist in developing appropriate TMC and in-vehicle unit system control settings, and to determine the sensitivity of the benefit estimates to alternate parameter settings or system configurations. The INTEGRATION simulation model will subsequently also be utilized to simulate and explore any level of market penetration traffic effects, as well as the transferability of the TrevTek results to other networks and/or different demand patterns.