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Introduction Traffic safety has been one of the world’s largest public health problems, especially in the sense that the victims are usually healthy prior to the crashes [1-5].
Jin: Traffic Injury Prevention Vol. 15 (2014), p. 89
Statistical modelling of motorcycle safety.
Meng: Journal of Advanced Transportation Vol. 47 (2013), p. 553
Meng: International Journal of Systems Science DOI:10.1080/00207721.2012.743617

Fig.1 Bridge Safety Monitoring and Analysis System structure Condition Assessment Bridge evaluation system assess the safety of existing bridges based on specific information, which also assess the basic performance of the existing bridge system as well as predicting the safety of its future.
It requires closure of the normal traffic and impacts on traffic flow, but also damages the structure.
The deflection and strain index are important in reflecting the safety of bridge structure.
The weight of each part of the overall structural safety is generally surveyed by experts.
References ［1］Rui Guo “Urban Bridge Management System of the key issues”[D], Tongji University March 2004(in Chinese) ［2］Robert J.Lark “Condition Monitoring and the Assessment of Bridge Structures at the Serviceability Limit State” First International Conference on Bridge Mainntenance, Safety and Management, July,2002 ［3］Livia Pardi, Finn Thogersen “Smart Structures: a European Funded Project” First International Conference on Bridge Mainntenance, Safety and Management, July,2002 ［4］Yong Zhuang, Liming Zhu “Intelligent Bridge System (IBS)” [J]Bridge Construction，3 2003(in Chinese) ［5］Fei Cui：“Parameter Identification and Capacity Assessment of Bridge ” [D], Tongji University, 2000(in Chinese) ［6］Donglian Tan, Rucheng Xiao：“Static Parameter Identification of Bridge Structure Based on Levenberg-Marquardt Algorithm” [J]Journal of Traffic and Transportation Engineering 2005,5 (3) (in Chinese) ［7］Donglian Tan：“Key Studies of Bridge Structural Condition Assessment Based on Monitoring”[

The critical density (kc) and jam density (kj) are the two most crucial densities in traffic flow.
As a traffic jam forms, h approaches infinity.
International Journal of Automotive Science And Technology, 6(4),412-417
[8] National Highway Traffic Safety Administration (NHTSA).
Journal of Mechanical Engineering and Sciences, 15(3), 8459-8468

And environmental factors are objective conditions affecting residents' travel choice of walking or bicycle riding, mainly related to the distance, traffic safety, weather, terrain and characteristics of public facilities [2].
And the avoidance of crime, traffic accidents and unintentional injury are related to Safety and road maintenance.
First, environmental safety should be improved.
At present, the improvement of safety can be realized from two aspects.
Taking measures of traffic calming, changing the form of roads, shrinkaging plants spacing and setting different road signs can limit the speed of motor vehicles and ensure residents’ travel safety.

The latter category improves driver and passenger comfort, and traffic efficiency, etc.
A malicious attacker can create bogus traffic warning messages and cause intelligent collisions [1].
Hubaux: IEEE Journal on Selected Areas in Communications, vol. 25, no. 8, pp. 1557–1568, (2007) [4] M.
Wu, in: Proc. of IEEE International Conference on Communications (ICC), (2009) [7] S.
Baker, in: Proc. of the Sixth Annual International Conference on Mobile Computing and Networking, Boston: ACM Press, pp. 255-265, (2000) [11]Osborne MJ, Rubinstein A.

Conclusions Consequently, ATRW welding haven’t proved itself to be reliable and quality method for connecting rails, economical point is connected with quality characteristics and traffic safety.
Welding journal, 76 (1997) 47-52
Welding International. 11 6 (1997) 452-461
Welding International. 6 (1) (1992) 5-8
Welding journal, 85 1 (2006) 24

Introduction With the increase of electric bicycle ownership and the speed, the traffic accidents increase rapidly.
There is a debate on the Electric bicycle traffic management.
Electric bicycle collision accident research literature mainly concentrated in the traffic management [1].
References [1] ChenPeng Shi: Journal of Chongqing Jiaotong University(Natural Science).
Vol. 20(2008), pp. 3885-3887 [3] Mukherjee S,Chawla A,Mohan D,et all: International Journal of Vehicle Safety.

It would be safety-guaranteeing if such a prediction is in a pessimistic way (minimal running distance in the prediction horizon).
Huang: China Journal of Railway Society Vol. 25 (2003), p. 98
Ning, in: Proceedings of International Conference on Computational Intelligence and Software Engineering (2009), p. 1
Endo, in: Proceedings of the Fourth IEEE International Conference on Fuzzy Systems and The Second International Fuzzy Engineering Symposium, IEEE Press (1995), p. 1741
J. van den Boom, in: Proceedings of the Sixth International Workshop on Discrete Event Systems (2002), p. 49

Journal of Urban Design, Vol 13.
Transportation Research Recod (TRR) Journal-1538
Safety Science.
From Crowd Dynamics to Crowd Safety.
Journal Transportation Engineering. 126: 343-349.

The appearing of VANETs comes from improving the road safety and the safe driving condition.
It will result in serious consequences to the traffic system.
The emerging of VANETs can help improve traffic management and roadside safety.
Hubaux, Securing vehicular ad hoc networks[J], Journal of Computer Security, vol. 15, no. 1, 2007, pp. 39- 68
Proceedings of the 3rd international workshop on vehicular ad hoc networks.