Assessment of Roundabout Capacity and Delay

Based on three decades of research and development by TRL, ARCADY is used to predict capacities, queues, deltas and accident risk at roundabouts. An easy-to-use tool for the busy traffic professional wanting to design new roundabouts and assess the effects of modifying existing sites. Available as a Roundabout module in Junctions 9.

Roundabouts are modelled using the well-established TRL/Kimber capacity relationships (the ARCADY Model), which take into account key roundabout geometries such as entry width, approach width, flare length, conflict angle, inscribed circle diameter and entry radius. This empirical framework intrinsically links roundabout geometry to driver behaviour and in turn to predicted capacities, queues and delays.

ARCADY has been successfully used to design and improve a number of roundabouts throughout the world. It has a host of satisfied customers including governments, multinational organisations and academic institutions. Its simple and intuitive interface means that it can be used effectively by everyone, in a relatively short space of time.

ARCADY 9 can model:

  • Roundabouts
  • Mini Roundabouts
  • Linked Roundabout Networks
  • Large or Grade Separated Roundabouts
  • Pedestrian Crossings (Signalled, Unsignalled and Adaptive)

Lane Simulation

First introduced in ARCADY 8, the Lane Simulation tool allows simple simulation of individual lanes to be performed on existing ARCADY models. The user can quickly see where unbalanced queuing may occur and if lane starvation may take place. The simulation takes into account the geometric layout of the roundabout, turning proportions and user-specified lane designations. Lane movements can then be altered easily using the roundabout diagram to explore and identify the optimum lane configuration.

If combined with the OSCADY module, it is possible to set up and model part signalised roundabouts, including signals on circulating lanes.

New features in ARCADY 9

Current Version: 9.5.1  Version History

System Requirements:

Windows XP or above

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Junctions 10 Student Version (ARC+PIC+OSC)
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Junctions 10 Licence for 1 User (ARC+PIC+OSC)
£3,900Add to cart

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Please note, a valid Student ID will be required before your purchase is complete.

Training Course Schedule

TRANSYT Foundation Course (3-Day)
9th - 11th March 2021 at Crowthorne
£745Add to cart
MOVA M8 Update Course (2-Day)
9th - 10th February 2021 at Crowthorne
£595Add to cart
JUNCTIONS 10 Course (2-Day)
12th - 13th May 2021 at Crowthorne
£720Add to cart
Introduction to Traffic Signals Course (1 Day)
27th April 2021 at Crowthorne
£390Add to cart
MOVA Engineers Course (2-Day)
3rd - 4th March 2021 at Crowthorne
£625Add to cart

The cost is per delegate and excludes VAT

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