An approach for the semi-automatic extraction of roads from high-resolution satellite imagery is proposed. Scale space, Edge-detection techniques are used as pre-processing for segmentation and estimation of road width. The detection of road is based on the cost minimization technique. The cost is estimated by taking various factors into consideration like variance, direction, length and width ...

The Padma Multipurpose Bridge Design Project comprises a new fixed crossing of the Padma River in Bangladesh, which will consist of a new main bridge approximately 6.15km long with spans crossing the Padma River. Viaduct spans on both sides of the Padma River support both the highway and railway traffic and lead this traffic onto the upper and lower levels of the main bridge. The length of the ...

1.1 Variables The independent variables are x , t : the length along the road and time. The main dependent variables are ρ ,Q : the car density and flux: number of cars per unit length of the road, and number of cars crossing a section per unit time; and U : the mean car velocity. The three dependent variables are related by the identity Q = ρU , (1) which follows from the following considerati...

Sediment is the greatest pollutant of forest streams. In the absence of wildfire, forest road networks are usually the main source of sediment in forest watersheds. An understanding of forest road erosion processes is important to aid in predicting sediment delivery from roads to streams. The flowpath followed by runoff is the key to understanding road erosion processes. On rutted roads, the fl...

BACKGROUND Farm vehicle-related crashes (crashes) are hazardous for farm and non-farm vehicle users; however, most studies examine risk factors of injury given a crash, and shed little light on risk factors of crashes. We evaluated the association of road sinuosity and gradient with crashes in nine Midwestern States from 2005 to 2010. METHODS We collected crash data from the state departments...

The road coloring problem is an interesing problem proposed over 40 years ago by Adler, Goodwyn and Weiss. Hundreds of mathematicians worked on this problem and failed to make the conjecture a theorem. Finally, in 2007, it was proved by a 60-year-old Israeli mathematician, Avraham Trahtman. It turns out the prove was quite simple after Trahtman partitioned the graph into cycles and trees. The d...

This study focused on the public transport risk assessment in District one of ​​Tehran through Fault Tree Analysis involving the three criteria of human, vehicle and road in Haddon matrix. In fact, it examined the factors contributing to the occurrence of road accidents at several urban black spots within District 1. Relying on road safety checklists and survey of experts, this study made an ef...

Road traffic accidents and the effects they subsequently incur are increasing dramatically, and estimating the cost of road traffic crashes could be a vital step in improving the recognition of this widespread problem. The main objective of this paper is to estimate the cost of road traffic crashes in Iran using the Human Capital (HC) Method. Results of this study indicate that the cost of road...

Transport use in island states shares many of the same characteristics as other developing countries, but with added complications of geographic isolation and lack of capital for many islanders. This paper examines the influence of the automobile in 45 Small Island Developing States (SIDS), as defined by the United Nations, using multiple regression techniques. Under these cross sectional proce...