Developing a Simulation Model to Evaluate the Capacity of Weaving Sections. Dr Hamid AL- Jameel. 1.The aims and objectives 2.Definition of a weaving section 3.Limitations of existing methods 4.Data Collection and Analysis 5.Car-following sub-model 6.Gap Acceptance sub-model
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Developing a Simulation Model to Evaluate the Capacity of Weaving Sections
Dr Hamid AL-Jameel
2.Definition of a weaving section
3.Limitations of existing methods
4.Data Collection and Analysis
6.Gap Acceptance sub-model
8.Calibration of the developed model
9.Validation of the developed model
10.The application of the developed model
11.Management scenarios used by the developed model
12.Conclusions and recommendations
The aims of this research are to build a simulation model capable of representing the factors influencing the behaviour of weaving vehicles and to evaluate the weaving capacity.
1.To determine the factors/variables that affect weaving capacity based on previous literature research.
2.To build a simulation model that is capable of representing weaving section using Visual Compact Fortran.
3.To collect data from several weaving sections with different geometric design.
4.To calibrate the system with field data and to validate the model using another set of field data.
5.To introduce countermeasures to improve the capacity of weaving section such as selection of the best location for warning signs or guide signs, and applying different types of management in terms of changing some geometric designs using pavement markings.
W1= R-M or M-R
W2=R-M or M-R
A new safety car-following model has been developed and calibrated with field data
After diverging loop
After merging loop
The developed model for weaving section has been developed as integrated model for different sub-models such as car- following, lane changing, gap acceptance and weaving. then the developed model has been calibrated with field data such as flow and speed taken from the upstream loop detector as input data and comparison with output data from the two down stream loops from both simulated and field data.
The developed model has been used to investigate the effect of some characteristics and new management scenarios on the capacity of weaving sections. These are:
A new management has been applied by this developed model after its calibration and validation. This new management can be summarised by changing the weaving section type from ramp weave (Type A) to Type B using just pavement markings. This change could be applied under specific conditions. The results of applying this management show more encouraging outputs in terms of increasing the level of speed and reducing the effect of bottleneck and queue formation for the field case taken from the Northenden Site 1.