Before revision:  The results of the method  of net present value (NPV) were evaluated economically , and the benefit and cost of each one was stated precisely in different years (\%28 improvement). The sensitivity analysis indicated that the cost of fuel, cost of travel time, cost of accidents and cost of pollutants have the highest impact factor in this assessment respectively .
After revision:  The results of the method of net present value (NPV) were evaluated economically , and the benefit and cost of each one was stated precisely in different years . At the end, some suggestion has been provided .