Measuring the effect of highway design features on cyclist behavior using an instrumented bicycle

2021 ◽  
Author(s):  
Ioannis Kaparias ◽  
Shahjahan Miah ◽  
Samuel Clegg ◽  
Yutian Gao ◽  
Ben Waterson ◽  
...  
Keyword(s):  
Design Features ◽  
Highway Design

scholarly journals Highway Design and Safety Consequences: A Case Study of Interstate Highway Vertical Grades

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Zongxin Tang ◽  
Sikai Chen ◽  
Jianchuan Cheng ◽  
Seyed Ali Ghahari ◽  
Samuel Labi
Keyword(s):  
Negative Binomial ◽  
Safety Performance ◽  
Segment Length ◽  
Crash Severity ◽  
Vertical Alignment ◽  
Design Features ◽  
Highway Design ◽  
Interstate Highway ◽  
Feature Lines ◽  
Different Levels

Vertical alignment, which includes vertical grades and lengths, is a critical aspect of highway design policy that influences safety. A full understanding of the effect of vertical grade and segment length on highway safety can help agencies to evaluate or adjust their design policies regarding vertical alignment design features (grade and length). For this reason, it is useful to assess the current relationships between design policy and safety performance. To address this task, this paper uses data from interstate segments to first establish the relationship between these design features and safety. Safety is expressed in terms of the three different levels of crash severity (fatal, injury, and property damage only). In its analysis, the paper departs from the traditional univariate models (where each crash severity is modeled separately) and instead uses a seemingly unrelated negative binomial (SUNB) technique, a multivariate model that duly accounts for the unobserved shared effects between the different levels of crash severity. In addition, the paper’s models duly recognize and account for the holistic nature of the grade and tangent length effects: the effect of the sum (interaction) of the vertical grade and length is different from the sum of their individual effects. The paper investigates the relationships for rural and urban interstate highway segments. Against the background of the developed models, the paper evaluates current design policies (specifications on vertical alignment grade and length) for similar classes of highways at a number of countries and presents a set of nomograms that feature lines representing points of equal safety performance. These charts can be used by the highway agencies to evaluate and compare their current or possible future highway design policies.

scholarly journals Evaluation of driver visual demand at different design speeds on complex two-dimensional rural highway alignments

2021 ◽  
Author(s):  
Ahmad Muneeb
Keyword(s):  
Human Life ◽  
Geometric Design ◽  
Two Dimensional ◽  
Design Features ◽  
Highway Design ◽  
Complex Curves ◽  
Design Characteristics ◽  
Design Speed ◽  
Design Consistency ◽  
Demand Profile

Road crashes are a major cause of loss of human life, property and money throughout the world. One of the reasons behind these crashes is the interaction between drivers and road alignments. The need to understand the factors that affect drivers has become obvious and is now being addressed by researchers. Moreover, driver workload is gaining attention as a measure of highway-design consistency as it directly reveals design features to the driver. This research focuses on evaluating driver visual demand at different design speeds along with other geometric design features for two-dimensional rural horizontal roadway alignments. Twelve such alignments having simple and complex curves were designed following the standards of the American Association of Highway and Transportation Officials (AASHTO) and the Transportation Association of Canada (TAC). The driver simulator at Ryerson University, Toronto, recently modified after the integration of a car, was used for the simulation of roadway alignments. Scenario Definition Language (SDL) was used to develop Event files for simulation and to save the required data. Twelve drivers drove the simulated alignments. The output data relating to driver visual demand were processed using MS Notepad and MS Excel. The visual demand calculations for full-element length (VDF), half-element length (VDH) and the first 30 m of element length (VD30) for curve and tangent sections of alignments were done using MS Excel. Statistical Analysis Software (SAS) was used to anlayze and develop models for VDF, VDH and VD30 for curve and tangent sections, first considering design speed only as explanatory variable and then considering design speed along with other geometric design characteristics as explanatory variables. It has been observed that visual demand increases with the increase in design speed. Besides, the combined effect of design speed an other geometric design characteristics (e.g., the type of preceding element, the turning direction of a curve) has significant effect on visual demand. It was also found that visual demand followed a Log Normalized distribution which was also observed by previous research. The developed models were used to establish the visual demand profile for highway design consistency evaluation. The comparison of visual demand profile and operating speed profile has shown that the visual demand can be an acceptable measure for evaluating the highway design consistency.

Identification and Evaluation of the Cost-Effectiveness of Highway Design Features to Reduce Nonrecurrent Congestion

2014 ◽  
Author(s):  
Ingrid B. Potts ◽  
Douglas W. Harwood ◽  
Jessica M. Hutton ◽  
Chris A. Fees ◽  
Karin M. Bauer ◽  
...  
Keyword(s):  
Cost Effectiveness ◽  
Design Features ◽  
Highway Design ◽  
The Cost

scholarly journals Evaluation of driver visual demand at different design speeds on complex two-dimensional rural highway alignments

2021 ◽  
Author(s):  
Ahmad Muneeb
Keyword(s):  
Human Life ◽  
Geometric Design ◽  
Two Dimensional ◽  
Design Features ◽  
Highway Design ◽  
Complex Curves ◽  
Design Characteristics ◽  
Design Speed ◽  
Design Consistency ◽  
Demand Profile

Road crashes are a major cause of loss of human life, property and money throughout the world. One of the reasons behind these crashes is the interaction between drivers and road alignments. The need to understand the factors that affect drivers has become obvious and is now being addressed by researchers. Moreover, driver workload is gaining attention as a measure of highway-design consistency as it directly reveals design features to the driver. This research focuses on evaluating driver visual demand at different design speeds along with other geometric design features for two-dimensional rural horizontal roadway alignments. Twelve such alignments having simple and complex curves were designed following the standards of the American Association of Highway and Transportation Officials (AASHTO) and the Transportation Association of Canada (TAC). The driver simulator at Ryerson University, Toronto, recently modified after the integration of a car, was used for the simulation of roadway alignments. Scenario Definition Language (SDL) was used to develop Event files for simulation and to save the required data. Twelve drivers drove the simulated alignments. The output data relating to driver visual demand were processed using MS Notepad and MS Excel. The visual demand calculations for full-element length (VDF), half-element length (VDH) and the first 30 m of element length (VD30) for curve and tangent sections of alignments were done using MS Excel. Statistical Analysis Software (SAS) was used to anlayze and develop models for VDF, VDH and VD30 for curve and tangent sections, first considering design speed only as explanatory variable and then considering design speed along with other geometric design characteristics as explanatory variables. It has been observed that visual demand increases with the increase in design speed. Besides, the combined effect of design speed an other geometric design characteristics (e.g., the type of preceding element, the turning direction of a curve) has significant effect on visual demand. It was also found that visual demand followed a Log Normalized distribution which was also observed by previous research. The developed models were used to establish the visual demand profile for highway design consistency evaluation. The comparison of visual demand profile and operating speed profile has shown that the visual demand can be an acceptable measure for evaluating the highway design consistency.

Laboratory Tire Wear Simulation Derived from Computer Modeling of Suspension Dynamics

1991 ◽  
Vol 19 (3) ◽  
pp. 122-141 ◽  
Author(s):  
C. Wright ◽  
G. L. Pritchett ◽  
R. J. Kuster ◽  
J. D. Avouris
Keyword(s):  
Computer Modeling ◽  
Computer Model ◽  
Normal Load ◽  
Operating Environment ◽  
Design Features ◽  
Handling Characteristics ◽  
Tire Wear ◽  
Suspension Dynamics ◽  
Instrumented Vehicle ◽  
Vehicle Testing

Abstract A method for determining the effect of suspension dynamics on tire wear has been developed. Typical city cycle maneuvers are defined by instrumented vehicle testing and data in the form of forward velocities and steer angles are used as an input to an ADAMS computer model of the vehicle. A simulation of the maneuvers generates a tire's operating environment in the form of normal load, slip, and camber variations, which contain all the subtle effects of the vehicle's suspension, steering, and handling characteristics. A cyclic repetition of the tire's operating environment is constructed and used to control an MTS Flat-Trac machine. In this way, accelerated tire wear can be generated in the laboratory which is directly related to the design features of the vehicle's suspension and steering systems.

Универсальный модуль для протравливания клубней

2019 ◽  
Author(s):  
S.A. Plakhov ◽  
V.M. Alakin ◽  
A.I. Ponomarev
Keyword(s):  
Technological Process ◽  
Modern Technology ◽  
Design Features ◽  
Universal Equipment

Кратко рассмотрена актуальность применения современной технологии ультромалообъемного опрыскивания и универсального оборудования для обработки картофеля защитностимулирующими препаратами. Приведены особенности конструкции универсального модуля, рассмотрен его технологический процесс и приведены основные качественные показатели работы.The urgency of application of modern technology of ultralow volume spraying and universal equipment for processing potatoes with protective and stimulating preparations is briefly considered. The design features of the universal module are given, its technological process is considered and the main qualitative indicators of work are given.

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