چکیده مقاله
Free flow speed FFS is defined as the theoretical speed when density and flow rate are zero This concept forms a fundamental part of the Highway Capacity Manual HCM On the other hand, weaving segments are considered as one of the most important elements in the freeway capacity and the level of service analysis in the HCM Hence, this study used three different methods to compute FFS of a ramp weaving segment based on field data, and then employed the HCM 2016 model to analyze the weaving segment Ultimately, model results were compared to field data and the relative superiority of the HCM 2016 method for field measurement of FFS was proven By contrast, the unsatisfactory performance of the HCM 2016 in predicting the speed of non weaving vehicles negatively affected the final performance of the model and caused under predicted results Thus, this study proposed a method which produces significantly more desirable results The merit of researches like this study becomes even more apparent by considering the circumstances in which references analogous to the HCM are developed in The HCM models depend on several contextual factors Therefore, it can be logically deduced that the most recent editions of this manual may not always be the most accurate ones for the traffic condition throughout the Iran highway networks
کلیدواژهها
نویسندگان
Meisam Akbarzadeh
Assistant Professor, Department of Transportation Engineering, IUT, Isfahan, Iran
Ahmad Mohajeri
M Sc of Civil Engineering, Transportation Research Institute, IUT, Isfahan, Iran
شیوه ارجاع
Akbarzadeh, Meisam and Mohajeri, Ahmad,1396,The Key Role of FFS Computation Methods in the HCM 2016 Performance, Case Study of a Weaving Segment,The 17th International Conference on Traffic and Transportation Engineering,Tehran
ارائهشده در
مجموعه مقالات هفدهمین کنفرانس بین المللی مهندسی حمل و نقل و ترافیک29 بهمن 1396 · تهران