In many contexts roundabouts have high alignment with Safe System principles. To help road designs, TMR offers free software to identify potentially hazardous geometry of proposed or existing roundabouts and to predict crash rates.
A Roundabout Numerical Design Tool (ARNDT) is a software program based on the results of a combined research project undertaken by the Queensland Department of Transport and Main Roads and the Queensland University of Technology.
Get the software free from the Queensland Government here: https://www.tmr.qld.gov.au/business-industry/Road-systems-and-engineering/Software/ARNDT