This paper examines the impact of Uber, the world's largest ride-hailing firm, on congestion. Drawing on data from large urban areas in Europe and the United States for the period 2008 through 2016, it finds a negative impact of Uber on congestion in Europe and a positive impact in the United...

We investigate the relationship between airline network structure and airport congestion. More specifically, we study the ways in which airlines adjust capacity to delays depending on the network type they operate. We find some evidence suggesting that airlines operating hub-and-spoke structures...

We empirically examine the relationship between traffic congestion and deaths in road accidents at the city level. We use panel data from 129 large cities in Europe for the period 2008-2017. We find strong evidence of a quadratic relationship between congestion and deaths in accidents, using...