Multiple vehicles are each equipped with a global positioning system (GPS) and a plurality of accelerometers to provide information related to vehicle's current state. A controller is provided to predict concurrent presence of at least two of the vehicles at a location at some future time. At least one of the vehicles further includes an indicator to indicate the potential for concurrent presence at the location in adequate time for the operator of the at least one of the vehicles to take appropriate evasive action to avoid concurrent presence at the location.