Safety Impacts and Other Implications of Raised Speed Limits on High-Speed Roads

2006 ◽  
Author(s):  
◽  
◽  
Keyword(s):  
High Speed ◽  
Speed Limits

Three Field Studies of Driver Speed Adaptation

1987 ◽  
Vol 29 (5) ◽  
pp. 541-550 ◽  
Author(s):  
Steven M. Casey ◽  
Adrian K. Lund
Keyword(s):  
High Speed ◽  
Field Studies ◽  
Traffic Density ◽  
Speed Limits ◽  
High Speeds ◽  
Traffic Site ◽  
Practical Implications ◽  
Adaptation Phenomenon

Three field studies of driver speeds were conducted to test the speed adaptation phenomenon and to define the practical implications of its effect. Sites were selected in which the speeds of vehicles previously exposed to high-speed conditions could be contrasted with speeds of vehicles not previously exposed to high speeds. The following conclusions were drawn from the results of this study: Conditions specific to a traffic site, such as legal speed limits, traffic density, and cross-street activity, determine the extent of speed adaptation. Speed perpetuation does not account for observed speed differences between speed-adapted and non-speed-adapted vehicles. The effects observed in the present study were significant but lower than in previous studies, possibly because of overall lower vehicle speeds. These findings indicate that proposals to increase speeds on rural interstates are likely to result in higher speeds on other, connecting roads as well.

Research on the Influence of Train Speed Change on the EMI of Pantograph-Catenary Arc to Main Navigation Stations

2021 ◽  
Vol 36 (4) ◽  
pp. 450-457
Author(s):  
Yutao Tang ◽  
Feng Zhu ◽  
Yingying Chen
Keyword(s):  
Power Supply ◽  
Electromagnetic Interference ◽  
High Speed ◽  
Electric Field Intensity ◽  
High Speed Train ◽  
Frequency Range ◽  
Speed Limits ◽  
Train Speed ◽  
Speed Change ◽  
Neutral Section

The electromagnetic interference (EMI) of the pantograph-catenary arc (PCA) to the main navigation stations will be affected when the speed of the high-speed train is changed. In order to study the influence of the speed change, we measured and analyzed the electric field intensity of the PCA generated at common and neutral section of power supply line at different train speeds. The frequency range in this study is the frequency of the main navigation stations (108 ~ 336 MHz). Both theoretical and experimental results show that PCA radiation increases with the increase of train speed. Besides, we calculated the maximum train speed without interfering the navigation signal. This work is useful for estimating EMI of the PCA at different train speeds and mitigating the interference to the navigation station near the highspeed railway by proposing corresponding speed limits.

Control and operation of tilting train services

1998 ◽  
Vol 212 (1) ◽  
pp. 73-84 ◽  
Author(s):  
F Schmid
Keyword(s):  
Great Britain ◽  
High Speed ◽  
Speed Limits ◽  
High Speed Railway ◽  
Journey Time ◽  
Railway Systems ◽  
Train Services ◽  
Technical Issues ◽  
Tilting Train ◽  
Railway Operation

Discussions on the best way forward to achieve reductions in journey time without the investment normally associated with the construction of new high-speed railways tend to concentrate on the technical issues to be resolved rather than on the very significant operational, legal and human issues that affect the economies of any high-speed railway operation. Many engineers and operators associated with long-established railway systems (1-4) view the introduction of tilting trains as the best way forward in situations where speed limits are imposed by track built with the objective of minimizing expenditure on civil works. Although there are instances where the introduction of tilting trains has yielded the benefits sought, there are many situations where the environment of the railway business effectively excludes this option. The author of the present paper has attempted to review the tilt debate from an operations angle, stimulated by some comments by Meyer (5), and focuses on developments in Great Britain.

NCHRP Report 350 Testing of W-Beam Slotted-Rail Terminal

1997 ◽  
Vol 1599 (1) ◽  
pp. 22-31 ◽  
Author(s):  
King K. Mak ◽  
Hayes E. Ross ◽  
Roger P. Bligh ◽  
Wanda L. Menges
Keyword(s):  
High Speed ◽  
Safety Performance ◽  
The Other ◽  
Federal Aid ◽  
Speed Limits ◽  
Crash Testing ◽  
National Highway ◽  
Level 3 ◽  
Test Level ◽  
Highway System

Two slotted-rail terminal (SRT) designs, one for use on roadways with speed limits of 72.4 km/hr (45 mi/hr) or less and the other for high-speed facilities, were previously developed and successfully crash-tested in accordance with guidelines set forth in NCHRP Report 230. Those SRT designs have been approved by FHWA for use on federal-aid projects. However, FHWA has since adopted NCHRP Report 350 as the official guidelines for safety performance evaluation of roadside features and required that all roadside features to be used on the National Highway System be crash-tested in accordance with the NCHRP Report 350 guidelines by 1998. It is therefore necessary to modify and retest the SRT designs in accordance with NCHRP Report 350 guidelines. The modified SRT design has successfully met the guidelines set forth in NCHRP Report 350 for Test Level 3 conditions, that is, 100-km/hr (62.2 mi/hr) and the results of the crash testing. The modified SRT design has been approved by FHWA for use on the national highway system.

Forces at low− and high−speed limits in magnetic levitation systems

1975 ◽  
Vol 46 (1) ◽  
pp. 422-425 ◽  
Author(s):  
S. W. Lee ◽  
R. Menendez
Keyword(s):  
High Speed ◽  
Magnetic Levitation ◽  
Speed Limits

scholarly journals A Brief Overview of Road Accidents and Recent Preventive Methodologies for Accident Hotspots in the United Arab Emirates

2022 ◽  
Author(s):  
Ijaz Ali
Keyword(s):  
United Arab Emirates ◽  
Road Safety ◽  
High Speed ◽  
Descriptive Analysis ◽  
Safety Data ◽  
Road Accident ◽  
Maximum Speed ◽  
Road Accidents ◽  
Speed Limits ◽  
Young Males

Abstract This paper highlights major causes of road accidents in the United Arab Emirates (UAE) and explores the possibility of reducing them through modern in-vehicle control technologies. Mostly, road safety data from the Global Road Safety Facility (GSRF), Road Safety Polices and Regulations for UK and UAE have been reviewed for comparison and analysis. It contains a descriptive analysis of road accident data which was taken from Ministry of Interior (MOI) - UAE website. It shows how the Pareto Principle applies to most of the road accidents in the UAE with young males’ poor driving habits and higher maximum speed limits being the major causes and, a systematic approach as per the Nilsson Power Model, to tackle these issues. It ends with the conclusion that, although high speed limits on urban roads and highways are some of the critical factors in causing dangerous road accidents but, it can be tackled with by implementing strict road safety policies and enforcing them with modern in vehicle technologies.

scholarly journals Impact of vehicular traffic on vertebrate fauna in Horton plains and Yala national parks of Sri Lanka: some implications for conservation and management

2017 ◽  
Vol 9 (3) ◽  
pp. 9928
Author(s):  
Suranjan Karunarathna ◽  
Sudheera Ranwala ◽  
Thilina Surasinghe ◽  
Majintha Madawala
Keyword(s):  
Law Enforcement ◽  
Sri Lanka ◽  
National Parks ◽  
High Speed ◽  
Vehicular Traffic ◽  
Road Mortality ◽  
Night Time ◽  
Speed Limits ◽  
Strict Enforcement ◽  
Developed Nations

Impacts of roadkills are extensively documented in developed nations.  Only a handful of studies on road mortality has emerged from developing nations where tourism and rural development have led to an expansion of transportation networks.  To fill such gaps, we conducted a survey to document roadkills in and around two tourism-heavy national parks of Sri Lanka and identified factors that contribute to road mortality.  Based on a questionnaire, we interviewed 68 local villagers, 56 local and 59 foreign visitors, and 57 safari drivers to document their opportunistic observations on roadkills, their awareness about roadkills, and to understand potential causes of roadkills.  We found 47 roadkilled vertebrate species at both parks; among these, 19 are threatened and 20 are endemic.  Our research revealed that herpetofauna were killed the most.  We concluded that increased visitation, high-speed driving, lack of awareness, and poor law enforcement as the likely causes of roadkills at both parks.  As mitigatory actions, we proposed posting speed limits, increasing awareness of the tourists and safari drivers, limiting vehicle access to the parks, seasonal or night-time access restrictions, and strict enforcement of the speed limits inside national parks. 

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