For modifying travel estimates, a memory stores maps and a plurality of travel records. A measurement circuit determines travel parameters. A current schedule anxiety is calculated as a difference between a nonzero constant value and the relative arrival time. The memory stores the travel parameters to a travel record of the plurality of travel records each time a specified driver drives to a location. A modification circuit modifies an arrival time travel estimate based on a driver profile for the specified driver calculated from the travel parameters and the plurality of travel records. The modification circuit further updates the driver profile in the memory with the current schedule anxiety and the speed based on current schedule anxiety. A display presents the modified arrival time estimate.