China has been using the American formula and LOS to analyze the weaving sections of urban ex- pressway all the time,but except that the urban expressway standard is different from American freeway,the operation characteristics,drivers' characteristics and so on are also different from those of foreign countries, so the analyzed result whether or not accords with actual conditions is still a question.The most effective,sci- entific method is to use the field data of China to calibrate the existing formula,s...