Observations on traffic flow patterns and traffic engineering practice

2002 ◽  
Author(s):  
Feng Wang ◽  
Lixin Gao
Keyword(s):  
Traffic Flow ◽  
Traffic Engineering ◽  
Flow Patterns ◽  
Engineering Practice

Organization Optimization of Traffic Engineering in Urban CBD

2013 ◽  
Vol 579-580 ◽  
pp. 890-893
Author(s):  
Mei Mei Huang ◽  
Qing Yang ◽  
Shang Lin Xiao
Keyword(s):  
Traffic Flow ◽  
Traffic Engineering ◽  
Queue Length ◽  
Motor Vehicle ◽  
Heavy Traffic ◽  
Optimization Methods ◽  
Difficult Problem ◽  
Signal Timing ◽  
Total Capacity ◽  
Business District

Orderly organization of traffic engineering in the urban CBD (Center Business District) is a difficult problem, with crowding people flow, heavy traffic flow and complex surrounding situation. This paper set CBD along Xinhua Street in Jinhua city center as an example, focused on the organization optimization process of traffic engineering in CBD. Through the survey on traffic engineering status of sections and intersections, it analyzed road congestion characteristics and intersection signal timing with Vissim software emulation, proposed traffic optimization methods as road channelization, intersection signal timing adjustment of Xinhua-Liberation Road. In Xinhua Street section, it can effectively canalized traffic flow by broadening 2 two-way lanes, adding four pedestrian crossing refuges, and separating Motor vehicle and non-motor vehicle separation barrier. It took queue length, number of stops, delay time three indicators as the objective function with the application of Synchro software adjusting the intersection signal timing. As a result, the total queue length could be reduced from 708.5m to 586.6m and total capacity from 2041 pcu/ h to 2838 pcu/ h.

Road network generalization considering traffic flow patterns

2019 ◽  
Vol 34 (1) ◽  
pp. 119-149 ◽  
Author(s):  
Wenhao Yu ◽  
Yifan Zhang ◽  
Tinghua Ai ◽  
Qingfeng Guan ◽  
Zhanlong Chen ◽  
...  
Keyword(s):  
Traffic Flow ◽  
Road Network ◽  
Flow Patterns

Capacity of Non-Signaled Intersection on Condition of Ice-and-Snow

2011 ◽  
Vol 361-363 ◽  
pp. 1901-1904
Author(s):  
Cheng Yuan Mao ◽  
Yu Long Pei ◽  
Guo Zhu Cheng ◽  
Li Wei Hu
Keyword(s):  
Traffic Flow ◽  
Traffic Engineering ◽  
Flow Characteristic ◽  
Critical Gap ◽  
Cold Zone ◽  
Traffic Characteristic ◽  
Snow Condition ◽  
Road Performance

Traffic characteristic on the conditions of ice-and-snow road performance is quite complex and that seriously influenced the capacity of non-signaled intersection. This paper comparatively analyzed the critical gap and headway on the condition of ice-and-snow or normal, and then analyzed the capacity of non-signaled intersection by the acceptability gap theory, and put forward the headway modify coefficient and the non-signaled intersection capacity modify coefficient for ice-and-snow. The results are the complementarities of traffic flow characteristic on ice-and-snow condition, and they are useful for directing setting traffic engineering facilities in the cold zone.

scholarly journals A modification of predictive three-component model for turbulent flows of complex slurries in pipelines based on experimental results

2020 ◽  
Vol 68 (3) ◽  
pp. 223-230
Author(s):  
Mikolas Kesely
Keyword(s):  
Turbulent Flows ◽  
Fine Particles ◽  
Mining Industry ◽  
Flow Patterns ◽  
Experimental Results ◽  
Engineering Practice ◽  
Average Particle ◽  
Particle Sizes ◽  
Carrier Fluid ◽  
Pressure Drops

AbstractThe paper describes a mathematical and physical modelling of flow of complex slurries in pipelines, i.e. a flow of slurries composed of solids covering a very broad range of particle sizes that overlaps more than one flow patterns – non-Newtonian, pseudohomogeneous, heterogeneous and fully-stratified. A typical examples are residual products (“tailings”) from mining industry with normal average particle sizes of 20 to 100 μm or more. Experimental results of flows of complex slurries composing of non-Newtonian carrier fluid and three fractions of glass particles in 50 mm pipe are presented. Depending on the particle size, particles show different flow patterns and therefore considerable differences in pressure drops. Fine particles tend behave as a homogeneous matter, while coarser particles exhibit heterogeneous behaviour and even coarser particles form a sliding bed. A mathematical 3-component predictive model for turbulent flow of complex slurries is presented based on well-established semi-empirical formulae developed originally for flows with Newtonian carrier. The predicted values of pressure drops show very reasonable agreement with experimental results and indicate suitability of the model for engineering practice.

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