Traffic flow theory, an interdisciplinary subject, applies mathematical and physical method to describe the traffic characteristics. It's a developing theory thus so far no comprehensive theory has been formatted in this field. When analyzing the similar characteristics between traffic and liquid flow, the macro traffic flow model based on the hydromechanics theory is established by adopting the hydromechanics method, and in the case of permanent traffic flow, the macro traffic flow model is solved and the definition of traffic press is given. Traffic flow takes on a flow-resistance condition ...
