The International Symposium on Frontiers of Road and Airport Engineering (iFRAE) was hosted by College of Transportation Engineering of Tongji University, Key Lab of Road and Traffic Engineering of MOE and Key Laboratory of Infrastructure Durability and Operation Safety in Airfield of CAAC. The conference was held in 2011 firstly and has been held every two years since 2015, which focuses on the two themes of transportation infrastructure and traffic safety. It has been successfully held for three times. The 4th iFRAE will be held in Shanghai from October 25th to October 27th, 2019. In addition, the iFRAE meeting includes an occasional small academic seminar (iFRAE-W series) and a graduate forum (iFRAE-S series). At present, the IFRAE-W series has been successfully held for two sessions with themes of intelligent roads and permeable pavements. The IFRAE-S series has been successfully held for two sessions with the following themes: pavement intellisense technology and paving material recycling technology.