Yes, I am aware of longitudinal studies that have been conducted to examine transport infrastructure and service quality. Longitudinal studies involve the collection and analysis of data over an extended period to observe trends and changes over time. In the context of transport infrastructure and service quality, these studies often assess the performance, efficiency, and user satisfaction with transportation systems.

Such studies may track the development and maintenance of transport infrastructure, including roads, bridges, public transit systems, and airports, over several years. Researchers typically investigate how changes in infrastructure impact overall service quality, accessibility, and the reliability of transportation services.

Additionally, longitudinal studies may analyze the effects of policy interventions, technological advancements, and investments in improving transportation systems. The goal is to gain insights into the long-term effectiveness of these measures and their impact on user experiences, safety, and environmental sustainability

You can add statistical data that are relevant from transportation institution. Goverments also provide plans for specific area, search for the policies. Academic writting may also relevant.

Sustainable transportation is a relevant concept. Using three basic aspects : economic, social, and environmental. Global findings are available.

(See: "digilib.itb.ac.id" ; seach:["5D Model","Bandung City", "Rifqi Fadhil"] for reference)

-Rifqi Fadhil, Dortmund

Check my following papers and all the precious citations related to road and air transportation. These will certainly help you

Article The Role of Air Transport Infrastructure Towards Breaking Se...

Article The Potential of Disruptive Transport Infrastructure for Tou...