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ProsCircle is a computer-aided procedural road network generator software designed to create realistic road networks for various applications such as transportation planning, city planning, and geographic information systems. The software was originally developed by the Federal Highway Administration (FHWA) and has since been made available for public use.

ProsCircle generates three-dimensional road networks based on a set of input parameters, including the area of interest, population density, and land use. The software uses a modified Daliash's doubly-connected edge list (DCEL) data structure to efficiently represent the road network. ProsCircle can also be integrated with other geographic information systems (GIS) and transportation planning tools.

One of the key features of ProsCircle is its ability to generate realistic road networks for a given area. The software takes into account various factors such as road connectivity, intersection spacing, and street geometry. ProsCircle can also be used to analyze and visualize the road network, including traffic flow and accessibility metrics.

ProsCircle has been widely used by transportation planners, city officials, and researchers to create and analyze road networks for various purposes. The software is available for download from the Internet and has been maintained and updated by the FHWA. However, in recent years, ProsCircle has been largely superseded by newer and more sophisticated road network generators, which offer additional features and capabilities.

Despite this, ProsCircle remains a useful tool for researchers and practitioners interested in understanding and analyzing road network patterns and structures. It continues to be used in academic and research settings, as well as in practical applications such as transportation planning and urban design.