Study On The Net Distance Of Interchanges And Other Facilities On Freeway

Interchange and other facilities (tunnels, service areas, rest area and toll station) as a major component of the highway, the reasonable spacing values will directly affect the quality and highway traffic safety. With the constant improvement of road network, highways, new construction and renovation projects continue to increase, and the tunnel interchange, service areas, rest areas and the main line toll station spacing more and more people attention. To improve interchange facilities with other regional capacity, operational efficiency, driving quality, the paper from the macroscopic and microscopic traffic flow theory, the design speed of different highway interchange and other facilities, the minimum spacing value.Interchange on the highway and tunnel clearance was defined and analyzed the impact of interchange and tunnel clearance of factors, including the operating characteristics of traffic, traffic signs and signals set the requirements, weaving section length requirements, the pilot operation requirements and other requirements; combination of experimental investigation to determine the main factors, the main factors and use of mathematical description of, respectively, and the minimum safe distance from the mark to meet the notice from the other two aspects of interchange of net exports and tunnel from the value of the study; to determine the design speed of different interchange spacing values and the tunnel mouth, and under special circumstances put forward does not meet the minimum spacing requirements Neighborhood improvement programs.On the interchange and service area (rest area) to determine spacing, is defined on the basis of their clearance, according to the service traffic interchange spacing settings or services, road users, physical, psychological characteristics and influencing factors such as vehicle performance requirements, consider the worst case the driver driving mode, using theoretical analysis to determine the different lane change speed interchange design and service area (rest area) the minimum clear distance, and finally for the special conditions the situation does not meet the requirements under the clear distance, made a number of improvement measures.On the interchange and clearance of the main line toll station, through the interchange and clearance between the main toll stations to define, mainly from traffic, traffic operating characteristics, the traffic capacity of the toll plaza and toll collection mode analysis, etc. Factors to consider the impact of spacing, use of relevant theoretical study of maturity reached the main line interchange and toll stations reasonable spacing between the recommended value.Thesis to guide highway interchange and other facilities spacing design is important, and the existing norms in interchange and other facilities spacing requirements for technical updating and improvement of an active exploration, with some practical significance.