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Finally, the key problems and development trend of bride safety monitoring were proposed. 1 Introduction Large span bridge structure is an important hub connecting roads, and the safety of the structure is significant to ensure the safety and smoothof road traffic.
The traffic need to be closed temporarily during the experiment, this for some road traffic volume is larger, can cause very serious impact and consequences.
Journal of Civil Engineering, 2006, 39 (2) : 46-52 (in Chinese) [7] Yongqian Zhao.
People's Traffic Press, 2003:903-907 (in Chinese) [12] Yadong Li.
Proceeding of 8th International Modal Analysis Conference.1990:1108-1115

In order to improve road safety, people should have a clear understanding on the traffic flow in the planning and implementation of traffic control, in conducting induction in a crowed road environment and in dealing with traffic accidents.
Chen: Journal of System Simulation, Vol. 13 (2001) No.5, pp. 831-836 (In Chinese)
Wen: Journal of Zhejiang University (Engineering Science), Vol. 40 (2005) No.4, pp. 704- 708 (In Chinese)
Lou: Journal of System Simulation, Vol. 18 (2006) No.9, pp. 2676-2680 (In Chinese)
Zheng: International Journal of Industrial and Systems Engineering, Vol. 3 (2008) No.1, pp. 70-86

In Proc. 14th International Modal Analysis Conference. 1996.
In Proc. of the 11th International Modal Analysis Conference. 1991.
In Proc. of the 17th International Modal Analysis Conference. 1999.
Journal of Bridge Engineering. 2011. 16(2), 259-266
Journal of Vibration and Control. 2011. 17(4), 589-603

Due to high speed and poor visual fitness, there exist potential safety hazards.
This thesis presents that the effects on the traffic safety made by visual performance change in the transition from Photopic to Scotopic or Mesopic vision should be considered, for the vision at the tunnel entrances and exits of a tunnel is Photopic while the vision outside is Scotopic or Mesopic.
A Comparative Study on the Luminance Level among the Domestic and International Standards of the Road Tunnels Lighting.
China Illuminating Engineering Journal, 21（5）, 26-32
Recommendations for the Lighting of Road for motor and pedestrian traffic.

, ride comfort and safety after extension are very good.
The construction effect is very high, ride comfort and safety after extension are very good.
Journal of Liaoning Technical University（Natural Science）, 2010,29(suppl):47-48
[7] Vion, Philippe; Poineau, Dani.Assessment, repair and widening of the Villeneuve-Loubet Bridge, France[J].Journal of the International Association for Bridge and Structural Engineering (IABSE), 2008,18(4):343-345
Widening of the cable-stayed bridge over the Rande Strait, Spain[J] Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) 2008 18（4）: 314-31 [9] Liu Guihong.

Introduction Traffic congestion not only wastes the time of transport users and passengers and raises fuel costs, but also contributes to environmental pollution, and even causes potential dangers to traffic safety.
According to PPK International Engineering Consulting Corporation[5], an Australian company, with the increase of cars, the degree of influence between vehicles has changed.
Traffic congestion level=Traffic volume equivalent /highway capacity （1） Traffic volume equivalent=equivalent of cars+equivalent of tractors+equivalent of non-motor vehicles Highway capacity means traffic capacity of different highway, which is ruled in Highway Technology Standard in China.
Traffic & Transportation, 2005(7):20~23
Journal of Dalian University, 2010(5):50~52

From the domestic and international traffic accident statistics data of view, The Curved slope sections combination is a place where happened most traffic accidents.
The reason is that in the curved and slope road segment , The vehicle should not only down slope, up slope also small radius turning, Easily lead to sudden changes in vehicle circulate speed is too large, posed a direct threat to road safety.
Namely to meet the vehicle safety to determine the smallest radius of the alignment index .
In order to curved slope sections combination traffic safety, This article from the experimental data of the drive a vehicle of curved slope sections combination start off, The article analyse internal relation in these variables between of the longitudinal slope , horizontal curve radius, speed and heart rate and law on curved slope sections combination. set up a model of the relationship between the longitudinal slope and vehicle speed and horizontal curve radius and heart rate.
[3] Liang Xia,Guo Zhong-yin, Fang Shou-en, Statistic Analyses of Relations between Road Alignment and Road Safety[J], Journal of Tongji University,2002.2 [4]Yu Shan-rong,Sun Jia-feng,Jiang Zhi-ying,Relation between Downgrade Horizontal Curve Connection and Traffic Safety[J], Highway and Transportation Research,2003.6

Intorduction Vehicle traffic safety problem is the eternal theme of vehicle development, with the rapid development of automobile, road traffic accident-prone, especially malignant accidents; automobile traffic safety issues have become increasingly prominent.
The emergence of intelligent vehicle, the vehicle provides a traffic safety problem solution[1,2].
The system uses MC9S12XS128 microcontroller as the core controller in combination with inductive sensors for traffic information[3].
Chow, D.Y.H, Intelligent Car Audio Design System for product planning,Expert Systems, v 16, n 1, p 19-32, February 1999 [3] Raimondi, Francesco M,An intelligent car driver for safe navigation with fuzzy obstacle avoidance,Lecture Notes in Computer Science v 5571 LNAI, p 336-343, 2009 [4] Lupu, V, Lupu, C,Real case study of a neuro-fuzzy intelligent car,SOFA 2007 - 2nd IEEE International Workshop on Soft Computing Applications Proceedings, p 109-116, 2007, 2nd IEEE International Workshop on Soft Computing Applications Proceedings, SOFA 2007 [5] Huang, Xiangdong, Xie, Chaolin, Xie, Yuecong,  Intelligent car styling technique and system based on a new aerodynamic-theoretical model, Chinese Journal of Mechanical Engineering (English Edition), v 15, n 2, p 110-115, June 2002 [6] Yang, Yang,Yan, Wenjun, Software Design of an intelligent car System based on μC/OS-II, 2006 Chinese Control Conference Proceedings, CCC 2006, p 1590-1594, 2007

Moreover, in the course of road widening, vehicle traffic will basically not be affected.
Introduction With the rapid development of world economy and increasing traffic, the demanding of highway grade aims higher and higher.
Journal of Tongji University.2004(32).2 197-201( in Chinese) [3].
LIU Changyong, On the Sustainable Development of Highway Traffic in China [J].Journal of Xi'an Highway University, 2000 (20).3:78-81( in Chinese) [4].
Zhixiang Zhou, Fang Li, Awang Qujue, Laterally Cantilevered Space Frame for the Roadway Widening in Steep-Sloped Mountainous Areas, Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE), v18, n3, August, 2008,254:258

So it should determine the permissible standard of rutting from two aspects: the traffic safety and road construction.
Permanent deformation limit value needs a massive traffic investigation, and after takes many factors (the traffic composition, road construction, traffic safety, comfort and economy and other factors) into account synthetically, it can be determined.
[2]JacksonNM, Baldwin C, “D·Assessingthe relative rutting sus-ceptibility ofHMA in the laboratorywith the asphalt pavementanalyzer”, he International Journal of Pavement Engineer-ing, 2000,(3) , PP. 203-217 [3]XIE Shui-you, ZHENG Chuan-chao, “Effects of tirecontact pressure on asphalt pavement structure”.
Journal of Chang’an University:Natural Science Edi-tion, 2004, 24(1), pp. 12-16
Journal of Traffic and Transportation Engineer-ing, 2007, 7(6), pp. 59-63.