Modern roundabouts are widely used at intersections with light traffic, generally providing safety and other advantages. However, large entry delays are often observed at roundabouts with unbalanced flow patterns, even though the entry traffic flow is not high. A metering signal-based strategy is examined to mitigate the above problems. A mathematical optimisation model is formulated firstly with the objective of minimising the total entry delay, subject to the metering signal thresholds. Then a solution algorithm based on VISSIM simulation is developed. Finally, a case study is carried out to testify the feasibility and applicability of the proposed model. Extended scenarios analyses under different levels of approach volume, different demand combinations and different proportions of right-turn vehicles (left-side driving) are also conducted. Results show that the methodology can effectively improve the operational performance, and a delay reduction of up to 25.7% can be expected using the metering signal-based strategy. This can provide a criterion for the use of metering at the roundabout.
Optimising total entry delay at roundabouts with unbalanced flow: a dynamic strategy for smart metering
IET Intelligent Transport Systems ; 13 , 3 ; 485-494
2018-11-28
10 pages
Article (Journal)
Electronic Resource
English
mathematical optimisation model , metering signal-based strategy , road vehicles , modern roundabouts , roundabout , delay reduction , road traffic control , entry delays , total entry delay , smart metering , entry traffic flow , metering signal thresholds , optimisation , road traffic , traffic engineering computing , different demand combinations , unbalanced flow patterns , light traffic , dynamic strategy
Metadata by IET is licensed under CC BY 3.0
Wiley | 2019
|Benefits of Metering Signals at Roundabouts with Unbalanced Flow: Patterns in Spain
Transportation Research Record | 2016
|The Potential of Metering Roundabouts: Influence in Transportation Externalities
Transportation Research Record | 2018
|Investigation on Entry Capacities of Single-Lane Roundabouts
Tema Archive | 2014
|Investigation on Entry Capacities of Single-Lane Roundabouts
British Library Conference Proceedings | 2014
|