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Safety and Security All concerns that traveller’s use a system they feel is relevant to the safety and security systems.
Using of scientific different sources and expertise, such as books, scientific journals, magazines and newspapers have been concerned by this method.
Health Promotion International, 14:271–279, (1999) [5] M.
Behbahani, “advanced system to organize, manages and maintain urban street”, j, Traffic, Summer Season. (2001) [7] H. 
L,Herman, Pedestrian and bicycle traffic planning principles, Fereydon Gh,Tehran University press, (2002) [8] M.H.

Introduction Severe weather is an important cause for air transport safety and flight delay.
Formulation (2) stands for safety.
Fifth International Conference on Aviation Weather Systems, Vienna, VA, 1993: 295-298
In Journal of Traffic and Transportation Engineering, 2009, 9(6): 64-68.
In Air Traffic Management, 2006 (1):38-39.

Safety Assessment Principles based on Statistics.
Its three spans range as 180m+360m+180m, and the deck is 36m broad with six traffic lanes in two ways.
Proceedings of the 4nd International Workshop on Structural Health Monitoring.
International Journal of Production Economics,2002,76:189-199 [6] Aparisi F, Haro CL.
International Journal of Production Research,2001,14: 3127-3140

This will cause traffic congestion and traffic accidents.
It means that automobile cannot pass the concave overpass, and the traffic will be disruption.
International Archives of Photogrammetry and Remote Sensing, 1996, 31(b4) :460-464
Journal of Geomatics.
Journal of Geomatics. 2003, 28 (4): 1-3

Vehicle stop and go frequently can cause driver fatigue, even traffic accidents.
With the continuous increase of traffic density, urban traffic congestion is getting worse.
By controlling the vehicle braking and driving, achieving vehicle stop and go automatically, reducing the driver fatigue in urban traffic, improving vehicle active safety and driving convenience.
By the research on various of traffic safety distance model domestic and international, summarize three existing safety distance models as follows: the safety distance model based on the kinematic analysis of the vehicle braking process [5], on time headway [6], and on driver model of preview [7].
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2001, 215(10): 1099-1115

Introduction The automotive braking performance is one of important factors affectting driving performance,which is related to traffic safety directly.
Journal of Jiangsu University(Natural Science Edition), 2004，25(1)：29－32
Journal of Traffic and Transportation Engineering, 2011，11(6)：62－67
International Journal of Automotive Technology, 2011, 12(4): 611-616
Journal of Traffic and Transportation Engineering,2009,9(2):50-59.

Characteristic Dynamic Increment for extreme traffic loading events on short and medium span highway bridges: Engineering.
Condition, safety and cost profiles for deteriorating structures with emphasis on bridges: Reliability Engineering & System Safety Vol. 89 (2005), p. 185-198
Study on steel box girder bridges partly stiffened by CFT arch ribs: Journal of Constructional Steel Research Vol. 70 (2012), p. 28-35
Dynamic Characteristics of Suspension Bridge Hanger Cables Using Digital Image Processing: NDT & E International Vol. 59 (2013), p. 25- 33
An Efficient Image-Based Damage Detection for Cable Surface in Cable-Stayed Bridges: NDT & E International Vol. 58 (2013), p. 18-23

With the popularization of passenger vehicle safety devices such as safety belt, airbag and so on, the chance that occupant’s upper limbs were injured seriously was decreased significantly in frontal impact.
Introduction With the development of vehicle safety technology, especially with the popularization of passenger vehicle safety devices such as safety belt and airbag, the chance that occupant’s upper limbs were seriously injured was decreased significantly in frontal impact.
Statistical data of China's traffic accidents in recent years showed that about 72% leg injuries were resulted from frontal crash accidents and hereinto 33% lower leg injuries index exceeded AIS 2 level which stood for moderate severity.
International Journal of Crashworthiness, Vol.7, No. 4, 2002
[8] Yi L, Hailin L, Junyuan Z: A new optimization approach for the driver restraint system for the frontal impact of a mini-bus, International Journal of Vehicle Systems Modeling and Testing, Vol. 3, No.1-2 / 2008.

First, the concentric circle structure about city traffic demands and traffic resources of cities.
But city traffic resource decisions can provide, also decides the city traffic saturation and how to effectively control traffic congestion, traffic congestion control.
Therefore, it brought a series problem, such as city traffic, traffic congestion, average speed is declining, but the traffic accidents increase.
Solve the city traffic jam, the overall objectives and positioning of city public transportation is the completion of the "city public traffic system guarantee, service quality, perfect facilities, operation safety, and management norms", the establishment of city public traffic status in the city traffic system, better satisfies people's basic demand for travel.
Traffic Demand Management and its Application in China [R].Journal of Traffic and Transportation Engineering, 2002, 6

With full knowledge of the basic features positioned in distributing, using and controlling resources in traffic planning, the traffic system developed with traffic demand [3].
So the primary work was to establish the appropriate policy framework on the basis of the traffic situation and planning, with Consulting domestic and international TDM measures, policy and practice.
So there is much safety weakness in the operation.
Feeder airports development Analysis with TDM strategy 4.1 Allocate resources properly The standard construction of the airports is higher than international standard.
References [1] Tao Yang, TDM and development prospect, Transportation Research and Exploration (1999) [2] Duhou Li, Analysis and strategy of TDM, Journal of Changan university (2005) [3] Fengyuan Wang, Transportation Demand Management and Application in China, Journal of Transportation Engineering(2002) [4] Fang zong, Activity-based travel mode choice model and analysis on traffic demand management, Journal of JIling university (2007) [5] Information on http://www.bjnews.com.cn