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This paper introduces the importance of the bolster spring in railroad traffic safety, and the present situation of detection about the free length of the bolster spring has been reviewed.
The load balance of each spring sets will directly affect the working life of railway trucks and traffic safety[1,2].
At this time, if the length of a group spring does not match, uneven stress may break springs or reduce their working life, and causing road traffic accidents.
The prism rotating depends mainly on motor drive, this mechanical scanning mode drived by motor has the highest international speed of about 400 times per second, generally speed is only dozens times per second.
Conclusions Bolster spring of railroad tracks has very important significance in train running safety.

International Journal of Science and Research Volume 4.
International Journal of Engineering and Management Research.
International Journal for Technological Research in Engineering.
International Journal Of Chemtech Research.
International Journal of Research and Reviews in Applied Sciences.

In recent year, traffic loads are significantly higher than when many of the country’s bridges were built, especially from truck traffic.
[2] National Transportation Safety Board.
Structural Safety, 2010(32):25-34 [6] Mark G.
International Journal of Protective Structures, 2010(1):23-40 [7] AASHTO. (1991) “Guide specification and commentary for vessel collision design of highway bridges.”
General Principles on Reliability for Structures, International Organization for Standardization [M] Geneva, 1998 [9] Melchers R E.

Meanwhile, people become more and more eager to return to the nature and enjoy the comfort, safety, belongingness of the home.
Contrasting with the traffic jams, the internal traffic of the estate is sparse.
Journal of Urban Technology, Vol. 17, No. 3, December 2010, 53–67
Architectural Journal, 2011(2)
International Urban Planning, 2008(4):24-28

But in fact, medium and short-span bridges take a large proportion in Chinese bridge structure, the safety of which shows decisive status on the guarantee of the secure and smooth road traffic.
Special problems in evaluating the safety of concrete bridges and concrete bridge components [J].
Journal of the structural division, 1975, 101
Structural safety, 1987, 4(4): 285-292
Proceedings of the 6th International Modal Analysis Conference, 1988: 690-695

Bolts as the key connection parts are directly related to the safety of high-speed train.
Because the yield stress and allowable shear stress of the bolt 8.8 grade was 640MPa and 256MPa, then the safety factor was 0.91 and 256 respectively.
(3) The axial stress safety factors obtained by the three methods respectively are 0.91, 0.92 and 0.70.
Acknowledgements This work has been partially sponsored by International Cooperation Project of "high-speed train development 380km/h " (2010DFB80050-1) and National science and technology support plan(2013BAG21Q01).
References [1] De-long FU, Meng-lin MA, Qian WANG, Hai-ying LU: Rolling Stock. 1 (2012), p.18-19 (In Chinese) [2] Xin JIN: Beijing Jiaotong University .12 (2012) (In Chinese) [3] Zhen CHEN, Jing DU, Yu-lin HE, Wei LIU, Bo FENG: Modern Manufacturing Engineering. 5(2011), p. 125-129 (In Chinese) [4] Yu-lin HE, Li-gang ZHANG, De-hai HAN, Jing DU: Journal of Chongqing University. 7 (2009), p. 762-766 (In Chinese) [5] Qian TANG, Lin-qing PEI, Bo LU: Journal of Chongqing University. 32 (2009), p. 1028-1031 (In Chinese) [6] Verein Deutscher Ingenieure: VDI2230( 2003) [7] Dario.Croccolo,Massimiliano.DeAgostinis,Nicolò Vincenzi: International Journal of Pressure Vessels and Piping.

Journal of Agricultural Mechanization Research, 2011(7):243-246.
IEEE International Conference on Volume: 1. 2008:1237-1240
International Conference on Digital Object Identifier. 2010: 521-523
Chinese Journal of Tropical Agriculture, 2011,31(7):75-78.
Journal of Agricultural Mechanization Research, 2008, (12): 163－165.

Many international ports have welcomed this trend and immediately adjusted to accommodate increased volumes.
Busy Traffic - 2 - - - 2 2.
W.K, Ports’ service attributes for ship navigation safety, Safety Science 50 (2012) 244-252
M, 4M Overturned Pyramid (MOP) Model: Case Studies on Indonesian and Japanese Maritime Traffic System (MTS), Proceedings of TransNav 2015, Gydnia, (2015) 275-282
K., Safety in shipping: The human element, Journal of Safety Research 37 (2006) 401-411

Introduction In traditional traffic study, traffic zone is the spatial units of traffic attraction and generation, and is the basic for transportation planning.
Defined the urban road network as, where is traffic grid, n is the number of traffic grid.
Journal of Transportation Engineering, 1985, 111(3):208-223
Road Traffic & Safety, 2007, 7(1):27-29. ( In Chinese) [6] Yang Bo, Liu Hai-zhou.
International Regional Science Review 2003, 26(2):153-66

Increase in the number of types of service and diversification of Qos requirements raise higher requirements in the communication network about network architecture, coverage area, safety and reliability.
The problem to be solved is efficient, reasonable traffic identification and traffic control and management mechanism.
INFOCOM 2006.25th IEEE International Conference on Computer Communications.
International Journal of Robotics and Autonomous Agents, 1998, Vol.24, No.34, Page(s):159-182
Proceedings. 2004 IEEE International Conference on DOI: 10.1109/SCC.2004.1358080 Publication Year: 2004 , Page(s): 633 – 637