Resources

About

Rodel is based on research and field observations taken by the Transport Research Laboratory (TRL). This includes investigation ...


Overview

Rodel is a tool for roundabout designers and practitioners which assists them to: • Improve design quality • Drastically ...


Foundation of Rodel

Capacity prediction in roundabout engineering has come a long way since the first circular intersections at the beginning of the ...


History

Rodel developer Barry Crown's depth of knowledge and breadth of experience with modern roundabouts is without parallel. ...


Get Started

Rodel is a powerful, accurate and efficient tool designed to allow the practitioner to understand operational effects of different ...


Features

Rodel has undergone major improvements and upgrades to include many new features and advancements, such as calibration ...


Capacity

Roundabout capacity has been debated since the first projects in Paris, New York, and London more than a century ago. ...


"At-Capacity" Operations

The capacity of a roundabout entry (also for signals) can only be definitively determined by measuring entering volumes during ...


Impact of Geometric Factors on the Capacity of Single-Lane Roundabouts

A paper co-written by Mark T. Johnson, P.E., MTJ Engineering and Rodel's exclusive trainer, and Ting-Li Lin, Ph.D.

Published in the 2018 Transportation Research Record, Journal of the Transportation Research Board.

Winner of the TRB Roundabouts Committee's Best Paper Award.


Release Notes