Roads are frequently cited as a public good even though economists have shown that privatizing the roads would solve some of the problems endemic to public roads, namely, high accident rates, congestion, and pollution (see Roth 1996, 1967; Block 1983, 1979, 1980). Economists have analyzed the problem of externalities and shown how the effects of freerider behavior can be contained. The question...

Two groups of 26 lambs were transported for 15 hours either on smooth highways or on rougher secondary roads. Nine of the animals in each group were monitored for heart rate and the plasma levels of cortisol, creatine kinase and lactate dehydrogenase, before the journey began, after four, eight and 12 hours and at slaughter. The pH of the meat was measured 45 minutes and 24 hours postmortem and...

Road mortality is thought to be a leading cause of turtle population decline. However, empirical evidence of the direct negative effects of road mortality on turtle population abundance is lacking. The purpose of this study was to provide a strong test of the prediction that roads reduce turtle population abundance. While controlling for potentially confounding variables, we compared relative a...

soil is known as the base material for many structure, on the other hand, some soils cause problems for some structures such as roads. some types of soils absorb moisture and swell then they may shrink when losing water. the changes of moisture in these soil samples cause changes their volume and pressure to layers of the pavement and eventually leads to destruction of roads. therefore, it is n...

conclusions in comparison with road traffic accidents on city streets, trauma patients in rtas on roads out of the city have longer pre-hospital time intervals and more severe injuries; therefore this group needs more pre-hospital resuscitation interventions. results findings of this study showed that, 75% of rtas occurred on city streets (n = 1 251). motor-car accidents were the most frequent ...