交通英文.ppt

status analysis of long downhill section safety,the definition of long downhill section,as a general rule，we defined it by two aspects： 1. longitudinal grade（the average longitudinal slope is 3% or more） 2. slope length（the length of continuous downhill slope is more than 5km）,the influence of long downhill section on road safety,have three points： 1 . traffic participant （mainly refers to the drivers） 2. vehicle 3. road alignment,traffic participant,owing to the long downhill section is so long and dangerous that the drivers cant concentrate their minds all the time，which would lead to traffic accidents。,the influence of long downhill section on road safety,have three points： 1 . traffic participant （mainly refers to the drivers） 2. vehicle 3. road alignment,vehicle,also，the long downhill section would have an influence on vehicle safety， which lead to appear the following dangers： 1. brake failure (large truck burst into hedge lane, causing casualties),2. engine overheating (because of constant shifting) 3. scuffing,vehicle,the influence of long downhill section on road safety,have three points： 1 . traffic participant （mainly refers to the drivers） 2. vehicle 3. road alignment,road alignment,as we all know，the road alignment has an mainly impact on trraffic safety ，for example ultra-high road, road width, transition curve and so on。,how do we analyze the long downhill section safety?,based on the above,we can conclude that analyzing the long downhill section safety