Setting condition and setting location of truck escape ramps in the USA, New Zealand, South Africa, Britain, Australia and China are analyzed in detail and summarized in this paper, it is found that more comprehensive consideration is made in the USA, and it is considered that the function of quantitative analysis for setting the location of truck escape ramp is limited. Finally, clauses and clause explanations which can be adopted in standards and regulations for domestic transportation industry are formed.

based on the relationship between speed and density according to the classification criteria of freeway service level when the design speed is 80km/h in Highway capacity manual, the method of microscopic traffic flow simulation supported by VISSIM software is adopted, such that, in the situation the capacity and desired speed are guaranteed to be consistent with the reality, the proposed values of the length of work zone under different traffic composition and traffic volume are given in the condition that a 2-way-8-lane freeway is half closed for construction with 2-way-4-lane being left open for traffic.

Via microscopic traffic flow simulation, based on the theory of traffic capacity and queue delay of vehicles on work zones and relying on the Reconstruction and Widening of Fekai Expressway, the paper gives suggested values of minimum space between adjacent work zones in the same direction under different traffic volumes and traffic compositions for references, during the construction of a two-way-8-lane highway with half road way closed. The result can promote work zone traffic safety.