Effects Of Roadside Vegetation On Drifting Snow
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Effects Of Roadside Vegetation On Drifting Snow
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Author : Illinois. Department of Transportation
language : en
Publisher:
Release Date : 1978
Effects Of Roadside Vegetation On Drifting Snow written by Illinois. Department of Transportation and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Highway engineering categories.
Effect Of Roadside Vegetation On Driver Behavior
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Author : Rajiv Parwathaneni
language : en
Publisher:
Release Date : 2016
Effect Of Roadside Vegetation On Driver Behavior written by Rajiv Parwathaneni and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
There is a strong argument for removing trees from the side of the road and keeping the area clear. This clear zone provides drivers, who have inadvertently driven off the road, the opportunity to regain control of their vehicle. The counterargument is that trees themselves can help to prevent accidents. For instance, well spaced trees might improve driver comfort by providing relief from the sun and wind. Trees can also help prevent snow drifting. Trees reduce storm water runoff and soil erosion, both of which can contribute to the degradation of the roadway structure. Pedestrians also benefit from roadside trees as they provide shade, windbreaks, visual buffers, and even physical protection from run-off-the-road vehicles.The Highway Capacity Manual recognizes that drivers change their speed depending upon the amount of clearance provided between the edge of the pavement and the nearest obstruction, also referred to as the lateral clearance distance. As this distance decreases, drivers are expected to reduce their travel speed. In driving simulators, participants have been observed to not only slow down but to move toward the center of the roadway when the lateral clearance to an obstruction (e.g. tree, guardrail) is reduced. What is not understood is whether the characteristics of the obstruction itself impacts driver behavior. The purpose of this thesis was to determine whether the change in driver behavior differs based on the height of the obstruction.A driving simulation study was designed as a 2x2 factorial experiment to test the effect of the location and height of roadside vegetation on the speed and lane position of drivers. A driving scenario was developed which simulated a 2-lane rural road with a speed limit of 55 mph. Four, 4 kilometers (2.5 miles) long segments of the road, were programmed to collect driver behavior data under the four experimental conditions. In segment 1, a continuous series of 9 m (30 ft) tall trees was placed adjacent to the outer lane lines along both sides of the road. Similarly, in segment 2, a continuous series of 1 m (3.3 ft) tall hedges were placed. Likewise, in segments 3 and 4, trees and hedges respectively were placed 1.8 m (3.0 ft) from the outer lane line.Forty-one participants drove the scenario, each experiencing all four experimental conditions, however the ordering of the segments was counterbalanced to control for any time series effects. The participants drove one segment as practice, followed by four experimental segments. The velocity and lane position of the simulator vehicle was recorded during each of the segments.The average velocity and lane position values were calculated for each segment. Analysis of variance tests indicated that the location and height of the vegetation did not impact the mean velocity. However, the tests indicated that the position of the simulator vehicle in the lane changed based on the location of the vegetation. When the vegetation was placed adjacent to the outer lane line, drivers moved toward the center of the roadway. The impact of the height of the vegetation on the lane position was not significant.
Wind Tunnel Analysis Of The Effects Of Planting At Highway Grade Separation Structures
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Author :
language : en
Publisher:
Release Date : 1979
Wind Tunnel Analysis Of The Effects Of Planting At Highway Grade Separation Structures written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Roads categories.
Blowing and drifting snow has been a problem for the highway maintenance engineer virtually since the inception of the automobile. In the early days, highway engineers were limited in their capability to design and construct drift free roadway cross sections, and the driving public tolerated the delays associated with snow storms. Modern technology, however, has long since provided the design expertise, financial resources, and construction capability for creating relatively snowdrift free highways, and the driver today has come to expect a highway facility that is free of snowdrifts, and if drifts develop they expect highway maintenance crews to open the highway within a short time. Highway administrators have responded to this charge for better control of snowdrifting. Modern highway designs in general provide an aerodynamic cross section that inhibits the deposition of snow on the roadway insofar as it is economically feasible to do so.
Integrated Roadside Vegetation Management
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Author : Robert L. Berger
language : en
Publisher: Transportation Research Board
Release Date : 2005
Integrated Roadside Vegetation Management written by Robert L. Berger and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Roadside improvement categories.
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 341: Integrated Roadside Vegetation Management examines the incorporation of integrated roadside vegetation management decision-making processes into highway project planning, design, construction, and maintenance. The report also documents existing roadside vegetation management research and practice.
Report
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Author :
language : en
Publisher:
Release Date : 1970
Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Highway research categories.
Effects Of Immissions On Roadside Vegetation
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Author : Lore Steubing
language : en
Publisher:
Release Date : 1981
Effects Of Immissions On Roadside Vegetation written by Lore Steubing and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
Design Guidelines For The Control Of Blowing And Drifting Snow
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Author : Ronald D. Tabler
language : en
Publisher: Strategic Highway Research Program (Shrp)
Release Date : 1994
Design Guidelines For The Control Of Blowing And Drifting Snow written by Ronald D. Tabler and has been published by Strategic Highway Research Program (Shrp) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Science categories.
Planning And Management Of Roadside Vegetation
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Author :
language : en
Publisher:
Release Date : 1982
Planning And Management Of Roadside Vegetation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Roadside improvement categories.
Planning And Management Of Roadside Vegetation
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Author : National Research Council (U.S.). Highway Research Board. Committee on Roadside Development
language : en
Publisher:
Release Date : 1956
Planning And Management Of Roadside Vegetation written by National Research Council (U.S.). Highway Research Board. Committee on Roadside Development and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1956 with Technology & Engineering categories.
Management Of Roadside Vegetation
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Author : T W (Terry) Parr
language : en
Publisher:
Release Date : 1988
Management Of Roadside Vegetation written by T W (Terry) Parr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.