TY  - JOUR
A1  - Wu, Ning
A1  - Lemke, Kerstin
T1  - A New Model for Level of Service of Freeway Merge, Diverge, and Weaving Segments
T2  - Procedia – Social and Behavioral Sciences
N2  - In most of the existing highway capacity manuals, level of service (LOS) of freeway weaving segments and ramp junctions is traditionally defined by the speed, volume or density in critical areas of merge, diverge and weaving manoeuvres. In that traditional concept several capacity values of different critical areas (merge, diverge, weaving) as well as upstream and downstream basic freeway segments within the influence areas are evaluated separately. In this paper, a new model which considers the total segment of freeway merge, diverge, and weaving as an entire object is introduced. A combined volume-to-capacity ratio is used for defining the LOS of the total segment. According to the probability and queuing theory, the volume-to-capacity ratio of the whole segment can be considered as a combination of volume-to-capacity ratios in the different critical areas under consideration. The parameters of the new model can be calibrated with field data. Those parameters are functions of the number of lanes on the freeways, the number of lanes in the on-ramps or off-ramps, the length of the acceleration, deceleration, or weaving sections. Varying the model parameters the function can be fitted to the existing capacity models for different types of weaving segments or ramp junctions. With this model, the traffic quality (LOS) can be obtained directly as a function of the volumes on the freeway and on the on-ramp or off-ramp respectively. The new model has the following advantages: a) a uniform function for all types of freeway weaving segments and ramp junctions, b) traffic quality assessment for all critical areas under investigation in one step, and c) easy calibration. The new model will be incorporated into the new edition of the German Highway Capacity Manual (HBS 201X).
KW  - Germany
KW  - Capacity (road, footway)
KW  - Level of service
KW  - Merging traffic
KW  - Freeway
KW  - Mathematical model
KW  - Deutschland
KW  - Kapazität (Straße)
KW  - Verkehrsqualität
KW  - Verkehrsverflechtung
KW  - Autobahn
KW  - Rechenmodell
Y1  - 2011
UR  - https://bast.opus.hbz-nrw.de/frontdoor/index/index/docId/2211
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:opus-bast-22116
VL  - 16
IS  - 0
SP  - 151
EP  - 161
ER  -