Light Rail Myths and Realities 4962The entire statement: Poor lane discipline cannot impede free flow conditions by definition. Poor lane discipline is irrelevant to capacity because it isn't possible to measure in near capacity conditions. Likewise it is a circular...
Light Rail Myths and Realities 4963Again, he asked for MY estimate. I gave it. Now you people want to call it a "measurement" and a "scientific estimate" which is neither what was asked...
From "Numerical Simulations of a Three-Lane Tra c Model Using Cellular Automata" A. Karim Daoudia and Najem Moussa, CHINESE JOURNAL OF PHYSICS VOL. 41 , NO. 6
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V. CONCLUSION In summary, we have presented an extension of a deterministic cellular automaton model to trafficc ow in a three-lane roadway, with two species of vehicles and for two versions of symmetry. A systematic comparison was made with the two-lane model. First, we showed that even in three-lane systems, where fast vehicles have more possibilities to overtake slow ones, particle disorder may dominate the behavior of the whole system at low densities.
From "Disorder effects in cellular automata for two-lane traffic" Wolfgang Knospe, Ludger Santen, Andreas Schadschneider, Michael Schreckenberg (July 8, 2004)
For single-lane trafficc models it is well known that particle disorder leads to platoon formation at low densities. Here we discuss the effect of slow cars in two-lane systems. Surprisingly, even a small number of slow cars can initiate the formation of platoons at low densities. The robustness of this phenomenon is investigated for different variants of the lane-changing rules as well as for different variants on the single-lane dynamics. It is shown that anticipation of drivers reduces the influence of slow cars drastically.
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IV. SUMMARY AND DISCUSSION We have shown that even in two-lane systems, where fast cars can overtake slow cars, particle disorder may dominate the behaviour at low densities. The strongest influence of slow cars has been observed for the NaSch model with symmetric lane-changing rules. For this model variant already one slow car leads to platoon formation on both lanes, i.e. the gap usage at low densities is not very ective. The platoon formation has obviously drastic influence on the performance of the system. ...
From "CELLULAR AUTOMATA FOR HIGHWAY TRAFFIC FLOW SIMULATION" Ning WU and Werner Brilon Insbreastute for Transportation and Traffic Engineering, Ruhr-University D-44780 Bochum,
4 CONCLUSION Traffic on streets and highways can be simulated efficiently by the simplified microscopic CAmodel. A CA can be described with the main properties: discrete division in time and space; isolate driving behavior and updating rules. The most important feature of a CA is the possibility of parallel computing.
Although the so-called STCA from Schreckenberg and Nagel produces good results for modeling queuing systems, it is not accurate enough for modeling the car-following behavior in the real-world and is therefore not suitable for modeling the traffic flow on motorways. The STCA was comprehensively calibrated and validated.
All of the above predict cogestion at *low density*. -- "Bernd Felsche - Innovative Reckoning, Perth, Western Australia ASCII ribbon campaign I'm a .signature virus! X against HTML mail Copy me into your ~-.signature and postings to help me spread!