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'Super fog' causes deadly multi-car pileup on Louisiana highway: Police_我的网站

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一 | 《科创板日报》7月22日讯近日，英伟达正式发布新一代Spectrum-6以太网交换芯片，用于支持基于Vera Rubin平台的超大规模AI基础设施。英伟达表示，Spectrum-6交换芯片将作为下一代Spectrum-X Ethernet交换机平台核心组件，通过高带宽、智能流量管理和故障恢复能力，提升AI工厂整体计算效率。 A "super fog" in Louisiana has caused a multi-car pileup on Interstate 55 near New Orleans, Louisiana, after severely lowering visibility, according to police.The crash, involving dozens of cars, occurred on Monday morning due to heavy fog conditions, according to Louisiana State Police. A long stretch of Interstate 55, a 24-mile-long highway over Lake Pontchartrain near New Orleans, is expected to be closed "for the foreseeable future," police said.Interstate 10 and Interstate 310 were also closed as a result of the crash, police said. Louisiana Gov. John Bel Edwards confirmed the accident in a statement Monday that there were fatalities in the crash, but did not say how many people were killed or injured.For hours after the crash, emergency crews worked to clear debris from both northbound and southbound lanes, according to state police.The super fog was caused by smoke from marsh fires burning in the region combined with dense fog developing in the area early Monday morning bringing extremely low visibility. In some spots, visibility was near zero, creating dangerous driving conditions.Super fogs typically form when condensed water vapor mixes with the smoke and moisture released from damp organic material smoldering from a nearby fire, such as brush, leaves and trees, according to the National Weather Service. Visibility can be lowered to less than 10 feet as a result, according to the NWS.This has been occurring in the region over the past several mornings, with the location of the densest fog and most dangerous conditions varying day to day, forecasts show.Super fogs can be especially dangerous when they develop near and over highways. The localized nature of the weather phenomenon means that visibility conditions can worsen rapidly within a very short distance, which can lead to a hazardous combination of sudden low to near-zero visibility and vehicles traveling at a high speed on a highway.The very limited visibility then hinders a driver's ability to react to changing conditions on a roadway.The National Weather Service issued a dense fog advisory for much of southeastern Louisiana on Monday morning, including from Baton Rouge to New Orleans.Over the past several days, the National Weather Service has been warning of the threat of dense fog during the early mornings in the region that would be worsened in some areas by nearby marsh fires. State police advised drivers to use their low-beam headlights if they can't see at least 500 feet in front of them.The fog dissipated by mid Monday morning, and all fog alerts have since been canceled.While areas of smoke will continue to be possible in the area as various marsh fires continue to burn, fog is not forecast to be a major issue Monday night, as weather conditions will be less favorable for fog development.Morning fog is not uncommon this time of the year for the region, but more than 86% of the state is currently battling extreme drought conditions, which is elevating fire danger. This could mean more instances of super fog in the coming days and weeks as cooler temperatures settle in, but the drought and wildfire risk persist.In addition, devastating drought and wildfire conditions continue to impact Louisiana. More than 60% of the state is now categorized at exceptional drought, the highest category of concern, according to the U.S. Drought Monitor. Just three months ago, 0% of the state was listed under exceptional drought."The combination of wildfire smoke and dense fog is dangerous, and I want to encourage all Louisianans in affected areas to take extreme caution when traveling," Edwards said in a statement.State troopers are working to notify families and investigate the exact cause of the crash, according to state police.It is unclear how many fatalities and injuries occurred as a result of the crash. The St. John the Baptist Parish Sheriff's Office directed media requests to Louisiana State Police.Additional information was not immediately available. Louisiana State Police did not immediately reply to ABC News' request for comment.。

二 | 包括CoreWeave 、微软、Nebius、SpaceXAI和特斯拉在内的AI基础设施建设者，将成为首批引入Spectrum-6来加速其AI工厂建设的公司。产品性能方面，Spectrum-6单交换容量达102.4Tbps，是上一代产品的两倍，旨在连接数十万级GPU和CPU，为大规模AI训练、智能体应用及推理任务提供网络支持。基于此，Spectrum-X以太网交换机能够实现比普通以太网高1.6倍的AI网络性能，并且在超过10万个GPU的部署中保持高达95%的网络效率。此外，Spectrum-6交换芯片同时支持可插拔式光模块和共封装光学（CPO），并支持液冷散热，可为整个AI工厂提供全面的端到端散热方案，同时提高网络电源效率。

三 | 截至目前，基于Spectrum-6的交换机已经进入全面生产阶段，且在全球千兆级AI工厂中普及。中国银河指出，Spectrum-X Ethernet Photonics是全球首款200G/lane大规模量产的CPO交换机。Vera Rubin量产Spectrum-X Ethernet Photonics进一步验证光互连在下一代AI数据中心中的价值。硅光子技术渗透率的提升也将同步带动上游光芯片需求的高速增长。 ▌交换机成Token生成倍增器交换机是一种用于电光信号转发的网络设备，而在英伟达看来，AI性能本质上是网络问题。其指出，全球最先进的人工智能工厂汇集了数十万个GPU和CPU，用于训练前沿模型、驱动智能体人工智能，并以前所未有的规模生成智能。

四 | 在这个层面上，网络成为推动Token生成的关键计算能力倍增器。对交换机领域的重视，也让这家科技巨头收获了客户与收入增长。作为Spectrum-6交换芯片的首批用户，CoreWeave表示：“将英伟达 Spectrum-6和液冷式Spectrum-X以太网基础设施引入AI工厂，有助于我们为客户提供训练前沿模型和更快部署推理所需的带宽、弹性和效率。” 据IDC最新数据，英伟达在2026财年第一季度首次成为全球数据中心以太网交换机市场的营收冠军。在过去，该领域由博通、思科等网络巨头主导。

五 | 开源证券表示，从交换芯片和GPU配比来看，传统架构交换机与GPU配比约为3:64，而英伟达NVL72包含72颗GPU和9个交换托盘，GBNVL72柜内交换托盘各配备2颗交换芯片，交换芯片与GPU配比达1:4，最新VRNVL72柜内交换托盘配备交换芯片数翻倍，交换芯片与GPU配比进一步提升至1:2，随着Scaleout和Scaleup双线演进，交换网络在计算集群中所占权重或逐步提升。

六 | 该机构强调，交换网络正算力配套设施配角，跃升为集群核心主角。随着AI模型参数扩张，算力需求已从单纯GPU堆叠，转向全维度系统架构重构。受单芯片物理功耗密度、互连带宽及内存容量瓶颈制约，算力增长边际效益持续递减，交换网络成为制约算力的天花板，当前系统级协同架构（如高带宽域互联）是突破单芯片性能上限的主要技术路径。