For pavement designers, the APA offers two versions of its software for the design and analysis of Perpetual Pavements.
Both versions of the software are available as free downloads.
PerRoad 3.5 uses the mechanistic-empirical design philosophy. The program couples layered elastic analysis with a statistical analysis procedure (Monte Carlo simulation) to estimate stresses and strains within a pavement.
The second version, PerRoadXpress, an is easy-to-use, all-on-one-screen program for designing Perpetual Pavements for low- and medium-volume roads and parking lots.