| Title |
A Study on Roundabout Modeling and Saturation for Level Of Service |
| Authors |
장현호(Chang, Hyunho) ; 윤병조(Yoon, Byoungjo) ; 이진수(Lee, Jinsoo) |
| DOI |
https://doi.org/10.12652/Ksce.2019.39.6.0869 |
| Keywords |
서비스 수준;회전교차로;포화교통류;한계교통량 Level of service;Roundabout;Saturation flow;Saturation traffic volume |
| Abstract |
The service level of the roundabout is estimated through an analytic model using the geometrical characteristics and parameter values obtained from the observations. Although a lot of researches have been conducted on the rotational intersection through an analytical model, the case of variable combinations is enormous, suggesting the range and service level of appropriate traffic volume according to the case study or limited characteristics through simulation. Therefore, in this study, the roundabout analysis model was constructed by using Visual Basic Application to make variable adjustment more easily. The constructed model analyzes traffic conditions according to various situations and analyzes the characteristics of roundabouts. As the result of analysis, the more the ratio of left turn and U-turn, the more the traffic distribution of each approached road was biased to one side, the limit traffic volume of the roundabout decreased and congestion appeared quickly. In particular, the more uneven the distribution of traffic was, the less the Saturation traffic volume was affected by the turnover rate. |