scholarly journals Interactive curve design using digital French curves

1999 ◽  
Author(s):  
Karan Singh
Keyword(s):  
Curve Design

Development and Adoption of Early AASHO Design Criteria

1998 ◽  
Vol 1612 (1) ◽  
pp. 26-33 ◽  
Author(s):  
Jerome Hall ◽  
Daniel Turner
Keyword(s):  
Design Parameters ◽  
Design Criteria ◽  
Adoption Process ◽  
Horizontal Curve ◽  
Highway Design ◽  
Initial Development ◽  
Design Processes ◽  
Blue Book ◽  
Curve Design ◽  
Independent Design

The conception, development, and adoption of early AASHO highway design criteria are documented. Examining the early efforts states used to select a design vehicle and develop horizontal curve design criteria illustrates why AASHO’s leadership was necessary. AASHO’s slow and somewhat haphazard criteria development, and the disparity from state to state, demonstrated the need for a national consensus in highway design parameters. AASHO’s role in providing these criteria is outlined through its initial development of policy booklets, followed by its 1954 publication of the landmark Blue Book. The processes by which nine states adopted the AASHO guidance are briefly reviewed. In several cases, the AASHO policy was embraced immediately, and in others it was accepted slowly as states clung to their independent design processes and only gradually updated their design criteria. A few simple conclusions are drawn about the development and adoption process, particularly as it may relate to tomorrow’s highway design criteria.

Modeling Safety Effects of Horizontal Curve Design on Injury Severity of Single-Motorcycle Crashes with Mixed-Effects Logistic Model

2017 ◽  
Vol 2637 (1) ◽  
pp. 38-46 ◽  
Author(s):  
Chunfu Xin ◽  
Zhenyu Wang ◽  
Chanyoung Lee ◽  
Pei-Sung Lin
Keyword(s):  
Logistic Model ◽  
Injury Severity ◽  
Unobserved Heterogeneity ◽  
Mixed Effects ◽  
Severe Injury ◽  
Horizontal Curve ◽  
Random Parameters ◽  
Horizontal Curves ◽  
Curve Design ◽  
Motorcycle Crashes

Horizontal curves have been of great interest to transportation researchers because of expected safety hazards for motorcyclists. The impacts of horizontal curve design on motorcycle crash injuries are not well documented in previous studies. The current study aimed to investigate and to quantify the effects of horizontal curve design and associated factors on the injury severity of single-motorcycle crashes with consideration of the issue of unobserved heterogeneity. A mixed-effects logistic model was developed on the basis of 2,168 single-motorcycle crashes, which were collected on 8,597 horizontal curves in Florida for a period of 11 years (2005 to 2015). Four normally distributed random parameters (moderate curves, reverse curves, older riders, and male riders) were identified. The modeling results showed that sharp curves (radius <1,500 ft) compared with flat curves (radius ≥4,000 ft) tended to increase significantly the probability of severe injury (fatal or incapacitating injury) by 7.7%. In total, 63.8% of single-motorcycle crashes occurring on reverse curves are more likely to result in severe injury, and the remaining 26.2% are less likely to result in severe injury. Motorcyclist safety compensation behaviors (psychologically feeling safe, and then riding aggressively, or vice versa) may result in counterintuitive effects (e.g., vegetation and paved medians, full-access-controlled roads, and pavement conditions) or random parameters (e.g., moderate curve and reverse curve). Other significant factors include lighting conditions (darkness and darkness with lights), weekends, speed or speeding, collision type, alcohol or drug impairment, rider age, and helmet use.

Local interpolation with weight functions for variable-smoothness curve design

1991 ◽  
Vol 23 (8) ◽  
pp. 579-582 ◽  
Author(s):  
A.P. Pobegailo
Keyword(s):  
Weight Functions ◽  
Curve Design ◽  
Local Interpolation ◽  
Variable Smoothness

Curve design with more general planar Pythagorean-hodograph quintic spiral segments

2013 ◽  
Vol 30 (7) ◽  
pp. 707-721 ◽  
Author(s):  
D.J. Walton ◽  
D.S. Meek
Keyword(s):  
Curve Design ◽  
Pythagorean Hodograph

Side Friction and Speed as Controls for Horizontal Curve Design

1999 ◽  
Vol 125 (6) ◽  
pp. 473-480 ◽  
Author(s):  
James A. Bonneson
Keyword(s):  
Horizontal Curve ◽  
Curve Design ◽  
Side Friction

Horizontal Well Planning-Build Curve Design

1989 ◽  
Author(s):  
Frank J. Schuh
Keyword(s):  
Horizontal Well ◽  
Curve Design

CORRESPONDENCE ON SPEED IN RELATION TO CURVATURE AND ASPECTS OF HIGHWAY-CURVE DESIGN.

1935 ◽  
Vol 240 (1935) ◽  
pp. 224-256
Author(s):  
W F ADAMS ◽  
H ADDISON ◽  
A J H CLAYTON ◽  
E H CORNELIUS ◽  
W DAY ◽  
...  
Keyword(s):  
Curve Design

Chain Codes and Their Application in Curve Design

1996 ◽  
Vol 58 (5) ◽  
pp. 464-470 ◽  
Author(s):  
Huub van de Wetering ◽  
Kees van Overveld
Keyword(s):  
Curve Design ◽  
Chain Codes
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