The paper gives an overview of findings from the first three MLStest pads. Distress occurred as both rutting and cracking. However,the extent of each distress type varied between the test pads.This was unexpected since they had similar structural compositions.Changes in pavement response and material characteristics weremonitored during testing using NDT. Tools used for measuring performanceincluded a profilometer and a procedure for capturing and monitoringcracks. A diagnostic evaluation showed that the differences wereprobably related to varying subgrade strength, and poor performanceof the lime treated limestone river gravel base and the asphaltsurfacing due to water ingress and aging.