scholarly journals Speed Limit and Fatalities in the U.S.: Implication for Transportation Policy

2017 ◽  
Vol 07 (05) ◽  
pp. 1398-1412
Author(s):  
Kashif Zaheer Malik ◽  
Ammar Aftab
Keyword(s):  
Transportation Policy ◽  
Speed Limit ◽  
The U.S

scholarly journals Evaluation of Driver Compliance to Displayed Variable Advisory Speed Limit Systems: Comparison between Germany and the U.S.

2016 ◽  
Vol 15 ◽  
pp. 640-651 ◽  
Author(s):  
Gary Riggins ◽  
Robert Bertini ◽  
Williams Ackaah ◽  
Martin Margreiter
Keyword(s):  
Speed Limit ◽  
Advisory Speed ◽  
The U.S

AIR TRANSPORTATION POLICY FOR SMALL COMMUNITIES: LESSONS FROM THE U.S. EXPERIENCE

2011 ◽  
Vol 2 (2) ◽  
pp. 1-27 ◽  
Author(s):  
Alda Metrass-Mendes ◽  
Richard De Neufville
Keyword(s):  
Large Scale ◽  
The United States ◽  
Transportation Policy ◽  
Small Communities ◽  
Large Scale Analysis ◽  
Global Trend ◽  
Airline Deregulation ◽  
The Us ◽  
Air Carriers ◽  
The U.S

The last decades have witnessed a global trend toward airline deregulation, which has significant impacts on national policies regarding air accessibility to smaller communities. One important result of this liberalisation is that carriers are no longer constrained to serve routes, and may thus neglect service to less profitable destinations with lower traffic. Economic deregulation can therefore have detrimental effects on smaller communities. The United States has dealt with this issue through its Essential Air Service program. Its experience suggests lessons for other countries. U.S. policies have been reasonably successful in sustaining basic air service to smaller communities over the past thirty years of deregulation. Moreover, they have done so relatively effectively and efficiently. A large-scale analysis of the U.S. experience, and three case studies of the communities of Columbia and Jefferson City (Missouri), Rutland (Vermont), and Merced (California) demonstrate this phenomenon. The results show overall gains in efficiency, mostly attributable to the US policy of encouraging competition between air carriers seeking to provide service to small communities. The major flaw in the U.S. arrangements seems to be that the policies have not kept up with changing conditions since deregulation in 1978.

The U.S. Federal Gasoline Tax: Time for a Change?

2017 ◽  
pp. 1-20
Author(s):  
David Besanko ◽  
Saahil Malik
Keyword(s):  
United States ◽  
Federal Budget ◽  
The United States ◽  
Transportation Policy ◽  
Pigouvian Tax ◽  
Gasoline Tax ◽  
Gasoline Consumption ◽  
Efficient Level ◽  
Gasoline Taxes ◽  
The U.S

Although the federal gasoline tax played multiple roles in financing surface transportation infrastructure in the United States, experts did not agree on the tax's purpose. Some argued that it was essentially a fee for users of the nation's federally supported highways. Others suggested that it should play a more prominent role in environmental, energy, and transportation policy by correcting for driving-related externalities. Still others suggested that it should be used to reduce the federal budget deficit. Finally, the tax itself had remained at the same level since 1993, and with the Highway Trust Fund virtually insolvent, many experts believed it was time for an increase. The case presents a background on the U.S. federal gasoline tax, an overview of the market for gasoline in the United States, and survey of gasoline taxes in U.S. states as well as several other countries around the world.The case can be used to discuss the incidence of the gasoline tax, as well as its role as a Pigouvian tax to deal with negative externalities related to gasoline consumption and driving. There is sufficient data in the case to enable students to analyze the incidence of the federal gasoline tax and to determine the socially efficient level of the tax in light of externalities related to gasoline consumption and driving.

What is the speed limit along the U.S. Phillips curve?

1991 ◽  
Vol 13 (3) ◽  
pp. 417-434 ◽  
Author(s):  
Martin F.J. Prachowny
Keyword(s):  
Phillips Curve ◽  
Speed Limit ◽  
The U.S

Megaregion Projections 2015 to 2045 with Transportation Policy Implications

2017 ◽  
Vol 2654 (1) ◽  
pp. 11-19
Author(s):  
Arthur C. Nelson
Keyword(s):  
United States ◽  
Western Europe ◽  
The United States ◽  
Transportation Policy ◽  
Policy Implications ◽  
Culture History ◽  
The U.S

A megaregion is characterized by common economic structures, culture, history, topography, and climate, among other factors. The United States is composed of 10 megaregions. Together they account for three-quarters of the nation’s population, but they make up a fifth of the land located in the contiguous states. Moreover, the U.S. megaregions are more densely settled than are megaregions in Western Europe. It would seem that America’s future is in the policies, planning, and investments aimed at the megaregion scale. To help advance such a proposition, this paper generates population, economic, and employment projections for the nation’s megaregions as well as for the nation as a whole. Implications and recommendations for next steps are offered.

Historical Introduction

1977 ◽  
Vol 35 ◽  
pp. 2-5
Author(s):  
R. D. Heidenreich
Keyword(s):  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
50Th Anniversary ◽  
Secondary Emission ◽  
Wave Nature ◽  
Nobel Prize In Physics ◽  
Primary Electrons ◽  
The U.S ◽  
Mutual Agreement

This program has been organized by the EMSA to commensurate the 50th anniversary of the experimental verification of the wave nature of the electron. Davisson and Germer in the U.S. and Thomson and Reid in Britian accomplished this at about the same time. Their findings were published in Nature in 1927 by mutual agreement since their independent efforts had led to the same conclusion at about the same time. In 1937 Davisson and Thomson shared the Nobel Prize in physics for demonstrating the wave nature of the electron deduced in 1924 by Louis de Broglie.The Davisson experiments (1921-1927) were concerned with the angular distribution of secondary electron emission from nickel surfaces produced by 150 volt primary electrons. The motivation was the effect of secondary emission on the characteristics of vacuum tubes but significant deviations from the results expected for a corpuscular electron led to a diffraction interpretation suggested by Elasser in 1925.

Variations in Surface Textures of Quartz Sand using Electron Microscopy

1970 ◽  
Vol 28 ◽  
pp. 494-495
Author(s):  
Eugene J. Amaral
Keyword(s):  
Electron Microscopy ◽  
Glass Industry ◽  
Glass Slide ◽  
Distilled Water ◽  
Early Paleozoic ◽  
Secondary Effects ◽  
Surface Textures ◽  
High Silica ◽  
Sand Deposit ◽  
The U.S

Examination of sand grain surfaces from early Paleozoic sandstones by electron microscopy reveals a variety of secondary effects caused by rock-forming processes after final deposition of the sand. Detailed studies were conducted on both coarse (≥0.71mm) and fine (=0.25mm) fractions of St. Peter Sandstone, a widespread sand deposit underlying much of the U.S. Central Interior and used in the glass industry because of its remarkably high silica purity.The very friable sandstone was disaggregated and sieved to obtain the two size fractions, and then cleaned by boiling in HCl to remove any iron impurities and rinsed in distilled water. The sand grains were then partially embedded by sprinkling them onto a glass slide coated with a thin tacky layer of latex. Direct platinum shadowed carbon replicas were made of the exposed sand grain surfaces, and were separated by dissolution of the silica in HF acid.

The Effects of Estradiol on Chronically Damaged Human Fallopian Tubes: A SEM Study

1985 ◽  
Vol 43 ◽  
pp. 648-649
Author(s):  
A. Toledo ◽  
G. Stoelk ◽  
M. Yussman ◽  
R.P. Apkarian
Keyword(s):  
Menstrual Cycle ◽  
Epithelial Cell ◽  
Secretory Cell ◽  
Estrogen Therapy ◽  
Fallopian Tubes ◽  
Cell Surfaces ◽  
Proliferative Phase ◽  
Cyclic Patterns ◽  
Sem Study ◽  
The U.S

Today it is estimated that one of every three women in the U.S. will have problems achieving pregnancy. 20-30% of these women will have some form of oviductal problems as the etiology of their infertility. Chronically damaged oviducts present problems with loss of both ciliary and microvillar epithelial cell surfaces. Estradiol is known to influence cyclic patterns in secretory cell microvilli and tubal ciliogenesis, The purpose of this study was to assess whether estrogen therapy could stimulate ciliogenesis in chronically damaged human fallopian tubes.Tissues from large hydrosalpinges were obtained from six women undergoing tuboplastic repair while in the early proliferative phase of fheir menstrual cycle. In each case the damaged tissue was rinsed in heparinized Ringers-lactate and quartered.

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