Based on a mass of data,the describing in detail for calculation on operation speed based on expression method being given in"Guidelines for Safety Audit of Highway",and the confirmation for principles on highway sections dividing with some relative formulas,is hoped to be helpful for designers in comprehending the concept of the operation speed.

Some indexes and suggests for road safety audit are proposed according to the calculation of operating speed and t.

route aligment,operating speed and roadbed slope.

After a period of operation,the operating speed of the series of Windows Operating Systems slows down and the systems must be reinstalled to solve the problem,which reduces work efficiency to a great extent.

Brief talk on relationship between running speed and design speed

Research purposes: The analysis of the speed target value of domestic and international intercity railway,the determination of reasonable speed target value network in China,construction cost,economic benefits,allocation of EMUs and the actual running speed of the train are made for the purpose of determing the reasonable speed target value of the Fourth Line of Haerbin-Qiqihaer Railway.

The article,based on the real measured data,combining years of testing experience and railroad engineering theory,analyses measured error of stagger value of contact wire qualitatively and quantitatively arised from running speed,elicits a expressions of speed-expiation for stagger value in real-time measure,improves real-time measured precision of stagger value.