Browse Projects > Detailed View

Estimation of Roundabout Capacity Using Intersection Perspective


Current HCM capacity is based on approach assessment. Entries are treated as independent T-junctions. However, there is lots of traffic interaction at roundabouts and often a mix of modes also influencing entry decisions. Interference of traffic in the roundabout impacts capacity. Pedestrian and cyclist activity impacts capacity. Approach-based (gap acceptance) assessments may not be providing enough information to accurately predict roundabout capacity.


Provide comprehensive capacity extimation and LOS calculation (average delay) for roundabouts taking into account interference effects..


Improved capacity estimations.


Existing reports and databases could be enough to construct a regression model, also microsimulation would be need.


produce a report and

Sponsoring Committee:AKD80, Roundabouts and other Intersection Design and Control Strategies
Research Period:12 - 24 months
Research Priority:Medium
RNS Developer:Marilo Martin Gasulla, Univ of Florida, Dr. Werner Brilon, Ruhr-University Bochum
Date Posted:08/10/2017
Date Modified:02/13/2020
Index Terms:Intersections, Vehicle mix, Gap acceptance, Approach lanes, Highway capacity, Roundabouts,
Cosponsoring Committees: 
Pedestrians and Bicyclists
Operations and Traffic Management
Planning and Forecasting

Please click here if you wish to share information or are aware of any research underway that addresses issues in this research needs statement. The information may be helpful to the sponsoring committee in keeping the statement up-to-date.