Title Description New! PerRoadXPress 1.0 Software PerRoadXPress1.zip (505 KB) An easy-to-use, all-on-one-screen program for designing Perpetual Pavements for low- and medium-volume roads and parking lots. PerRoad 3.3 Flexible Perpetual Pavement Design & Analysis Software PerRoad 3.3 a mechanistic-based procedure for the design of flexible long-life or perpetual pavement structures. (1.28 MB - MSI)