Research On Pedestrian Safety And Direction Perception Of Road Lighting In Old Community At Night

China’s urban construction has entered a stage of rapid development,and the people’s living environment has continued to improve.At the same time,there are a large number of old communities built in the last century in many cities.Since it is difficult to completely demolish it and rebuild it,the state advocates the transformation of the environmental problems of old communities to meet the needs of the people for a better life.However,the old community is dim at night due to its backward facilities,and the overall lighting environment is not optimistic.The lighting of outdoor spaces in residential areas has a vital impact on residents’ night travel and personal safety.Inadequate lighting may adversely affect pedestrian safety and residents’ night travel pathfinding.However,excessive outdoor lighting can also cause huge energy consumption.,Form light pollution,increase financial and environmental costs.Therefore,it is necessary to develop outdoor lighting applications that can not only meet user needs but also meet energy-saving requirements.In this context,the thesis selected 15 typical outdoor roads in Tianjin ’ s old communities as the research object.Through field surveys,subjective investigations and other forms,the outdoor roads of the old communities ’ outdoor roads were illuminated at night for residents’ walking safety and In-depth research on the two aspects of direction perception,combined with field measurement results and subjective questionnaire surveys,found that the existing road night lighting in old communities is as follows: the lighting of all roads and nodes is unqualified,and the satisfaction of road lighting is generally low.After analysis,the main reasons are: the space layout of the lighting fixtures has problems;the power of the fixtures does not match the demand of the road;some nodes lack lighting facilities,etc.In addition,the vegetation on both sides of the road occludes the lights,which also has a negative impact on pedestrian safety and direction perception.At the same time,there are also problems such as the lack of clearly visible guidance signs at night.In order to find a solution,SPSS software was used to analyze the road lighting environment of the old community.It is concluded that the two parameters of road surface average illuminance and minimum semi-cylindrical illuminance are significantly related to the pedestrian safety satisfaction of group roads and roads in front of houses.It is concluded that the horizontal illuminance of the road surface and the minimum semi-cylindrical illuminance are significantly related to the pedestrian direction perception satisfaction of the group road,the road in front of the house and its intersection,and then five fitting formulas are obtained.According to the above research results,it is concluded that the current standards for the average illuminance and minimum semi-cylindrical illuminance of the road surface in residential areas cannot meet the needs of pedestrians in old communities for road night lighting.It is recommended to set the standard value of the average illuminance of the road surface of the old community group road to 12.0lx,and the standard value of the minimum semi-cylindrical illuminance to 3.0lx;it is recommended to set the standard value of the average illuminance of the road in front of the old community house to 11.0 lx,the minimum semi-cylindrical illuminance standard value is set to 2.0lx;it is recommended to set the minimum semi-cylindrical illuminance standard value at the intersection of the old community group road and the road in front of the house to4.0lx.Apply the research conclusions drawn above,select the old community roads with poor test data and subjective evaluation,use DIALux software to optimize and simulate the lighting environment,and set the parameters of different light sources to further optimize the lighting indicators to obtain The optimal lighting scheme is verified by introducing the lighting index values into the above-mentioned fitting equation,designing the optimal lighting scheme for the night lighting of the old community roads to be improved,and providing a feasible way for the application of lighting indexes in actual scenes.