Macro-level studies of the effect of transportation infrastructure investment on regional economic growth have shown positive relationships between the level of public investment and the rate of private capital formation, employment, and output growth. At a microlevel, however, it is not quite...

The ancient Romans built an excellent system of roads, the development of which required systematic planning, creative design and high-quality construction and maintenance capabilities. At the empire's peak about 85,000 km (53,000 miles) of road connected the capital Rome with its far-away...

Past research on the cost structure of urban bus transportation shows conflicting results with respect to key economic issues such as economies of scale and other properties of the underlying technology. It is hypothesized that these results stem from three major problems areas: the form of the...

Cost overruns have been shown to occur in a significant number of transportation investment projects. While there is some literature on the causes of risk of cost overruns in transportation capital investment, little is available on how properly to estimate this risk and how to incorporate risk...