Bringing together researchers and practitioners in the field of Traffic and Logistic Engineering to present their latest results and findings in a fruitful and open-minded environment. Under these circumstances, ICTLE was established in 2012 and was successfully held in Chennai, India (2012), Istanbul,Turkey (2013), Antalya, Turkey(2014), Orlando, USA (2015), Dubai, UAE (2016), Bangkok, Thailand (2018), Paris, France (2019), Virtual Conference (2020). In the last eight years, ICTLE attracted attendees from more than 15 countries. 2021 9th International Conference on Traffic and Logistic Engineering (ICTLE 2021) will be held in Macau on August 9-11, 2021, co-organised by Faculty of Science and Technology (FST) of University of Macau. ICTLE 2021 will offer an extensive program of interest to academia, government and industry. It will include several distinguished keynote speakers and three conference days full of parallel sessions, Shenzhen city visiting, etc. A series of exciting speeches to develop skills in and advance awareness of requirements engineering practices is of particular interest to industry.