The purposes of this study are twofold: (1) to investigate the accuracy of estimation power of the individual models, such as those of Highway Capacity Manual(HCM), Korea Highway Capacity Manual(KHCM), and National Cooperative Highway Research Program(NCHRP) Report 339; and (2) to develop an adjusted delay model which can be applied to the signal control system in urban areas.
The study is mainly focused on four subjects related to the research purposes, which are as follows: (1) characteristics of exsisting delay models; (2) inherent problems in exsisting delay models; (3) validation of the proposed model by the comparison of observed delay with estimated delay; and (4) a method which can be applied to develop an appropriate delay model for actual signal control systems by the adjusted factor of the proposed model.