Analysis of influencing factors of traffic safety

Analysis of influencing factors of traffic safety in road lighting design

this paper mainly summarizes the types, structural characteristics and performance of biomedical materials used in Ophthalmology, and focuses on the optical column materials and support materials used in artificial cornea, intraocular lens materials, artificial glass materials, artificial eye prosthesis and artificial eye materials, artificial lacrimal passage and tear materials Corneal contact lens materials and ophthalmic drug carrier materials, looking forward to the development direction of biomedical ophthalmic materials. In August 2004, presided over by the Department of urban construction of the Ministry of construction, Tianjin University School of architecture architectural technology, let's introduce the functional characteristics of a digital seat belt tension tester: the Institute conducted a questionnaire survey and statistical analysis on the lighting status of 120 cities above prefecture level in 20 provinces of the country. Among them, the average road lighting construction of each city in the urban lighting construction investment increased from 5.5611 million yuan in 1998 to 15.832 million yuan in 2003. At the same time, with the rapid development of landscape lighting in cities across the country, the share of urban public space and urban architectural lighting has increased, but the investment proportion of road lighting has always accounted for more than half of the share. It can be seen that road lighting is an important part of urban lighting construction

urban road lighting provides traffic safety and guidance for drivers, while creating a safe and comfortable environment for pedestrians. Traffic safety is the core content of road lighting design. This paper will analyze the impact on road lighting traffic safety through the study of drivers' visual characteristics

2 analysis and discussion of influencing factors

2.1 changes in vision at night

2.1.1 effects of changes in outdoor illumination

drivers drive vehicles through sensory organs, of which 80% - 90% of the information is obtained through vision, so the driver's visual function has the greatest impact on the safety of traffic, and the visual characteristics at night change with the change of the environment. According to statistics, the outdoor illumination drops to 100lx 30 minutes after sunset, and then drops to 1LX 20 minutes later. In the completely dark night, the vision can only reach 3% to 5% of the daytime

2.1.2 influence of vehicle speed change

under normal circumstances, the visual angle of the human eye is 200 degrees, and the human eye can feel the existence position of objects within the range of left and right 100 degrees, but practice has proved that the area where the human eye can distinguish color is only 70 degrees. With the increase of speed, the field of vision of the eyes will become narrower and narrower, just like looking through a tube. Things near and on both sides cannot be seen, and only things far away can be seen, which is the movement effect

this effect begins to appear at about 40km/h, and the horizon is 130 degrees at 75km/h; When a level with an accuracy of 0.10/1000 mm is used to find ± 1 grid 100km/h, the horizon is only 80 degrees. However, a large number of unsafe factors may come from moving objects beside the road, such as pedestrians, animals, etc., which may enter the driving path. Drivers must see them in advance and identify their direction of travel. Therefore, the lighting around the road must be considered in the road lighting design, so that the peripheral visual membrane of the human eye plays a role and finds moving objects in time

in addition, with the change of speed, human vision also changes, as shown in Table 1

2.2 visual recognition of color

the pyramidal cells of the human visual membrane are responsible for observing the details of objects and distinguishing colors. Pyramidal cells have the function of observing the existence and movement of objects under low light, but they cannot distinguish colors and details. According to experiments, when using low beam lighting at night, white and yellow signs are the most recognizable, followed by green and red, and blue is the least recognizable; When using high beam lighting, red, white and yellow signs are the most recognizable, followed by green, and blue is the least recognizable. It can be seen that the road guiding lighting should be designed based on this