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556 research outputs found

Pedestrian Traffic Fatalities by State: 2016 Preliminary Data

Author: Richard Retting
Sam Schwartz
Publication venue: Governors Highway Safety Association
Publication date: 02/02/2017
Field of study

The present study, based on preliminary data from all states and the District of Columbia (DC) for the first six months of 2016, found an increase of seven percent in the reported number of fatalities compared with the first six months of 2015. More than twice as many states had increases (34) than had decreases (15 plus DC) compared with 2015.After adjusting for anticipated underreporting in the preliminary state data, GHSA estimates the number of pedestrians killed in 2016 increased by 11 percent compared with 2015. This was the largest annual increase in both the number and percentage of pedestrian fatalities in the 40 years that national records have been kept, with the second largest increase occurring in 2015. In addition, pedestrian deaths as a percent of total motor vehicle crash deaths have increased steadily, from 11 percent in 2006 to 15 percent in 2015.The number of nationwide pedestrian fatalities for all of 2016 was estimated based on preliminary data provided by State Highway Safety Offices (SHSOs) for the first six months of 2016, taking into account historic data regarding the relative proportions of pedestrian fatalities that occurred in the first and second halves of the year. About 6,000 pedestrian fatalities are estimated to have occurred in 2016, which could make 2016 the first year in more than two decades with more than 6,000 pedestrain deaths

IssueLab

Pedestrian Traffic Fatalities by State: 2015 Preliminary Data

Author: Heather Rothenberg
Richard Retting
Sam Schwartz
Publication venue: Governors Highway Safety Association
Publication date: 03/03/2016
Field of study

The number of pedestrian fatalities in the United States increased 19 percent from 2009 to 2014, a period in which total traffic deaths decreased by about 4 percent. In fact, pedestrians now account for the largest proportion of traffic fatalities recorded in the past 25 years. Earlier studies by the Governors Highway Safety Association (GHSA), based on preliminary data reported by State Highway Safety Offices (SHSOs), were the first to predict recent increases in pedestrian fatalities.The present study, based on preliminary data from all states and the District of Columbia (DC) for the first six months of 2015, found an increase of 6 percent in the reported number of fatalities compared with the first six months of 2014. After adjusting for anticipated underreporting in the preliminary state data, GHSA estimates there has been a 10 percent increase in the number of pedestrians killed in 2015 compared with 2014. In addition, pedestrian deaths as a percent of total motor vehicle crash deaths have increased steadily from 11 percent in 2005-2007 to 15 percent in 2014. It has been 25 years (1990) since pedestrians accounted for 15 percent of total traffic fatalities. Preliminary data indicate that pedestrians will represent about 15 percent of total fatalities again in 2015

IssueLab

Da Vinci Fluids, catch-up dynamics and dense granular flow

Author: Blumenfeld Raphael
Edwards Sam F.
Schwartz Moshe
Publication venue
Publication date: 22/04/2010
Field of study

We introduce and study a da Vinci Fluid, a fluid whose dissipation is dominated by solid friction. We analyse the flow rheology of a discrete model and then coarse-grain it to the continuum. We find that the model gives rise to behaviour that is characteristic of dense granular fluids. In particular, it leads to plug flow. We analyse the nucleation mechanism of plugs and their development. We find that plug boundaries generically expand and we calculate the growth rate of plug regions. In systems whose internal effective friction coefficient is relatively uniform we find that the linear size of plug regions grows as (time)