Road safety index is an important indicator that has been recently introduced as a useful tool to measure the quality of life in many countries and cities. Road safety index is a complex index and it has at least three main components, including road user behavior, vehicle safety, and road infrastructure effects. Many researchers have selected studying road performance from road safety index pe...

The operation of a water supply system (WSS) is inextricably linked with the possibility different types failure. It very common for these failures to be random in nature. results reliability studies carried out many systems revealed, example, incidental pollution, power issues, failure machinery, damage plants, or natural disasters. As result WSS failure, we deal state threat safety (TSS) loss...