In the traffic impact studies (micro level) accessibility is affected by different activities within a commercial, office or residential land. Activities include pedestrian and bicycle conditions, transport infrastructure changes, network capacity, level of service within a site. The aim of this paper is to provide better understanding of how transportation infrastructure changes within the commercial site influence on car-based trip generation rates at micro level. Transportation changes include development of new connections to the site: signalized and unsignalized intersections with different allowed traffic movements. Three parameters: demand, supply and readiness were considered and analyzed. Readiness (the number of traffic flows at the connections after changes in geometrical parameters) was determined by Synchro / Simtraffic 6.0 simulation tool with assumption that the level of service of the site connection should be better than D / E. Verification and validation of simulation model were performed. Demand for commercial site was calculated based on ITE trip generation rates taking into account “smart growth” criteria for local conditions. Supply including existing incoming and outcoming traffic flows for the commercial site was observed by the survey.