Transport survey methods - in the era of big data facing new and old challenges

This document presents an introduction to the ISCTSC Special Issue of Transport Research Procedia. It synthesizes the discussions held at the 11th International Conference on Transport Survey Methods, and describes the contents of the selected contributions. This conference has been held in different countries from all over the world, involving an increasing group of enthusiastic and generous specialists, willing to share their knowledge. This 11th conference was an opportunity to discuss the state of the art on transport survey methods, but also to question the way transport surveys are conducted in the era of big data. We took the opportunity to identify the main challenges, and the most important questions.