Abstract: The invention provides an automated TDIAM system which includes algorithms using a geographic information system which can calculate drive time automatically at time of reservation by taking into account the geometry of the road network, expected construction delays, weather patterns, and historical traffic conditions and speed to determine the “least cost” route on the date and time of service and from the pickup location to the drop off location. If the GIS is experiencing an outage and is not available, or in countries where GIS Systems do not yet have the geometry of the road system established but at least have major points of interest geocoded, an alternative approach to computing drive time must be used. This approach involves use of geocodes to establish the origin and destination points and the proprietary application of three dimensional geometry and related formulas to calculate the estimated drive time.