  Transportation decision-makers from government agencies play an important
role in addressing the traffic network conditions, which in turn, have a major
impact on the well-being of citizens. The practices, challenges, and needs of
this group of practitioners are less represented in the HCI literature. We
address this gap through an interview study with 19 practitioners from
Transports Qu\'ebec, a government agency responsible for transportation
infrastructures in Qu\'ebec, Canada. We found that this group of
decision-makers can most benefit from research about data analysis tools and
platforms that (1) provide information to support data quality awareness, (2)
are interoperable with other tools in the complex workflow of the
practitioners, and (3) support intuitive and customizable visual analytics.
These implications can also be informative to the design of tools supporting
other decision-making tasks and domains.
