A new article publishing in the latest issue of Review of Policy Research examines the evolution and devolution of speed limit laws and their effects on fatality rates. The author did not find a significant increase in fatalities per miles driven after speed limit laws ceased to be national and states could, and some did, increase their highway limit to more than fifty-five miles per hour. "Automobile safety features and enforcement emerge as important factors in increasing highway safety; speed limits are far less important," author Robert O. Yowell explains.
Although speed limits bring to mind the notion of public safety, they were formed in the 1970s to combat a gasoline shortage. In the 1980s the focus shifted to public safety while some speed limit regulation devolved back to states; the maximum speed on rural interstates could be raised to 65 mph. In 1995 and involving some controversy, Congress returned all speed limit authority back to the states. Analysis of the highway deaths per mile driven after the 1974 nationalization of the maximum highway speed indicates an initial greater decline in deaths than had been the trend, but the long-term decreasing trend reemerged following the shock. Dr. Yowells research finds others reasons besides speed for the long-term trend of increased highway safety. (From 1968 to 1991, the fatality rate per 100 million declined by 63.2%.) Technical progress in car manufacturing, increased use of seat belts by drivers and passengers, an increase in the minimum legal drinking age, and the general maintenance of roads all affect this rate.
Jill Yablonski | EurekAlert!
Laser rescue system for serious accidents
29.11.2016 | Laser Zentrum Hannover e.V.
Bremen University students reach the final at robotics competition with parcel delivery robot
19.10.2016 | BIBA - Bremer Institut für Produktion und Logistik
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
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