| Summary: | 碩士 === 國立成功大學 === 交通管理(科學)學系 === 85 === Space-discrete flow models of freeways have been applied
widely in foreigncountries. In order to understand the
applicability of the space-discrete flowmodels in domestic
freeway traffic, model verification and validation are performed
in this study. In addition, a homogeneous traffic density
control method is applied in simulation models to prevent the
amplification of traffic congestion.
Model verification consists of program debugging, model logic
verification,model calibration and sensitivity analysis. First,
it introduces the theoretic and structure of the models in
details. Then it identifies the parameters by using of the least
squares output error method. According to the result of the
parameters identified, it reveals that domestic drivers have
driving characteristics full of adventure. Besides, the analysis
of parameters sensitivity show that when applying the models in
different road conditions, we should adopt different speee-
density characteristic function. Model validation consists of
figure comparison( including speed and volume ), and statistical
test ( including the index ofMean Absolute Percentage Error and
t-test ). The results of figure comparisonshow that the
progression of the model and real traffic have same tendency.
The index of MAPE on volume and speedare less than 14% and 10%,
and the resultsof t-test also can''t reject the null hypothesis.
It can be stated that space-discrete flow models are applicable
to domestic freeway traffic. Finally,
simulation has been carried out based on the traffic flow
characteristics that are created from the traffic data of a
domestic freeway using the adopted macroscopic traffic model.
From the simulation of different traffic situation: non-
homogeneous traffic flow, partial lane closure and road
blockage, it is seen the traffic congestion has been
significantly improved by the homogeneous traffic density
control method. Pollution and fuel consumptionare also somewhat
reduced.
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