Over the past three decades, urban congestion has become more costly in terms of time, money and fuel. Congestion has generated, for the 101 large U.S urban centers, 4.8 billion hours of travel delay in 2011, up from 1.1 billion hours in 1982. We examine the scaling relationship between the...

We examine the scaling relationship of pedestrian fatality counts as a function of the population size of 115 to 161 large U.S cities during the period of 1994 to 2011. We also examine the relationship of non-pedestrian and total traffic fatality counts as well. We used both annual and panel...

Despite a large number of studies on multiple socioeconomic factors influencing urban PM2.5 pollutions in China, only a few comparable studies appeared for developed countries. We analyzed the impact of three major socioeconomic factors of city income per capita, population density of city, and...