Law enforcement agencies have begun utilizing traffic and crash data to improve traffic law enforcement delivery. However, many agencies often do not have the resources or expertise to harness fully the benefits this ...Law enforcement agencies have begun utilizing traffic and crash data to improve traffic law enforcement delivery. However, many agencies often do not have the resources or expertise to harness fully the benefits this data offers. A free to use, scalable traffic crash hot spot detection tool was developed to aid law enforcement agency decision makers, statewide to the local municipality level. The tool was developed to identify crash hot spots algorithmically with </span><span style="font-family:Verdana;">a range of customizable parameters based on location, date and time, and</span><span style="font-family:Verdana;"> crash factors, enabling quick, dynamic queries. These capabilities provide the ability for law enforcement agencies to conduct “what if” analyses and make data-driven allocation decisions, placing officer resources where they are most needed. The two-step algorithm first identifies potential hot spots based on </span><span style="font-family:Verdana;">crash density and then ranks each hot spot using a standardized z-score </span><span style="font-family:Verdana;">measure of relative significance. To test the viability of the tool, a pilot was conducted identifying 27 hot spots across Wisconsin where targeted enforcement was then deployed. Despite officer skepticism, results from the pilot found officers at sites targeted for speeding and seatbelt violations were nearly twice as likely to initiate traffic stops compared to non-targeted hot spots. Empirical Bayes before-and-after crash analyses found fatal and injury crashes reduced significantly by nearly 11% during the months with targeted enforcement, while property damage crashes and total crashes were unchanged. Overall, the results show the algorithm can identify hotspots where, coupled with targeted enforcement, traffic safety improvements can be made.展开更多
基于中国保险汽车安全指数25%偏置碰撞工况,对某新能源汽车A柱的结构设计方案进行了研究。对比分析了基础结构、复合车身解决方案(Composite Body Solutions,CBS)胶块增强结构、热气胀形管梁增强结构对碰撞安全性的影响,介绍了CBS胶块...基于中国保险汽车安全指数25%偏置碰撞工况,对某新能源汽车A柱的结构设计方案进行了研究。对比分析了基础结构、复合车身解决方案(Composite Body Solutions,CBS)胶块增强结构、热气胀形管梁增强结构对碰撞安全性的影响,介绍了CBS胶块和热气胀形的制造工艺,并对热气胀形工艺进行了仿真分析,对比分析2种增强结构的工装投入和单件成本。研究发现,在均能实现小偏置碰撞安全性优秀等级的前提下,1500 MPa热气胀管梁方案在单件成本及轻量化方面比CBS胶块方案更具优势。展开更多
文摘Law enforcement agencies have begun utilizing traffic and crash data to improve traffic law enforcement delivery. However, many agencies often do not have the resources or expertise to harness fully the benefits this data offers. A free to use, scalable traffic crash hot spot detection tool was developed to aid law enforcement agency decision makers, statewide to the local municipality level. The tool was developed to identify crash hot spots algorithmically with </span><span style="font-family:Verdana;">a range of customizable parameters based on location, date and time, and</span><span style="font-family:Verdana;"> crash factors, enabling quick, dynamic queries. These capabilities provide the ability for law enforcement agencies to conduct “what if” analyses and make data-driven allocation decisions, placing officer resources where they are most needed. The two-step algorithm first identifies potential hot spots based on </span><span style="font-family:Verdana;">crash density and then ranks each hot spot using a standardized z-score </span><span style="font-family:Verdana;">measure of relative significance. To test the viability of the tool, a pilot was conducted identifying 27 hot spots across Wisconsin where targeted enforcement was then deployed. Despite officer skepticism, results from the pilot found officers at sites targeted for speeding and seatbelt violations were nearly twice as likely to initiate traffic stops compared to non-targeted hot spots. Empirical Bayes before-and-after crash analyses found fatal and injury crashes reduced significantly by nearly 11% during the months with targeted enforcement, while property damage crashes and total crashes were unchanged. Overall, the results show the algorithm can identify hotspots where, coupled with targeted enforcement, traffic safety improvements can be made.
文摘基于中国保险汽车安全指数25%偏置碰撞工况,对某新能源汽车A柱的结构设计方案进行了研究。对比分析了基础结构、复合车身解决方案(Composite Body Solutions,CBS)胶块增强结构、热气胀形管梁增强结构对碰撞安全性的影响,介绍了CBS胶块和热气胀形的制造工艺,并对热气胀形工艺进行了仿真分析,对比分析2种增强结构的工装投入和单件成本。研究发现,在均能实现小偏置碰撞安全性优秀等级的前提下,1500 MPa热气胀管梁方案在单件成本及轻量化方面比CBS胶块方案更具优势。
