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Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
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Suppose a car moves on flat ground and turns to the left. The centripetal force causing the car to turn in a circular path is due to friction between the tires and the road. For this, a minimum coefficient of friction is needed, or the car will move in a larger-radius curve and leave the roadway. Let's now consider banked curves, where the slope of the road helps in negotiating the curve. The greater the angle of the curve, the faster one can take the curve. It is common for race tracks for...
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An interesting force in everyday life is the force of drag on an object when it is moving in a fluid. Like friction, the drag force always opposes the motion of an object. Unlike simple friction, the drag force is proportional to some function of the velocity of the object in that fluid. This functionality is complicated and depends upon the shape of the object, its size, its velocity, and the fluid it is in. For most large objects, such as cyclists, cars, and baseballs, that are not moving too...
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Instantaneous velocity is the quantity that measures how fast an object is moving along its path. In other words, the instantaneous velocity of an object is the limit of the average velocity as the elapsed time approaches zero, or the derivative of displacement with respect to time. Like average velocity, the instantaneous velocity is a vector with the dimensions of length per unit time. Instantaneous velocity can have both positive and negative values. The instantaneous velocity can be...
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Acceleration is in the direction of the change in velocity, but it is not always in the direction of motion. When an object slows down, its acceleration is opposite to the direction of its motion. Although commonly referred to as deceleration, this causes confusion in our analysis as deceleration is not a vector, and does not point to a specific direction with respect to a coordinate system. Therefore, the term deceleration is not used. For example, when a subway train slows down, it...
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Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street
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Speed behaviour upon approaching freeway curves.

Johan Vos1, Haneen Farah1, Marjan Hagenzieker1

  • 1Department of Transport and Planning, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands.

Accident; Analysis and Prevention
|July 9, 2021
PubMed
Summary
This summary is machine-generated.

Driver speed before curves is key for road safety. Road design elements like curve radius and sight distance influence speed adjustments upon entering curves.

Keywords:
Freeway curve anticipationHigh Frequency Floating Car DataSight distancesSpeed profiles

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Area of Science:

  • Traffic Engineering
  • Road Safety Research
  • Driver Behavior Analysis

Background:

  • Actual driver speed behavior approaching curves is crucial for road design and safety assessment but is under-researched.
  • Existing research primarily focuses on driving behavior within curves, neglecting the critical speed selection phase before curve entry.

Purpose of the Study:

  • To identify freeway characteristics influencing drivers' speed selection before entering curves.
  • To analyze the relationship between road geometry, sight distances, and deceleration points.

Main Methods:

  • Utilized High Frequency Floating Car Data (HFFCD) for individual speed profiles.
  • Conducted detailed reconstruction of 153 Dutch freeway curves and their surroundings.
  • Performed 3D sight distance analysis and correlation/regression analysis.

Main Results:

  • Curve radius and pre-deceleration speed are primary factors in speed selection.
  • Sight distances and cross-section characteristics influence the start of deceleration.
  • Deceleration concludes around 135m post-curve entry; curve speed correlates with deflection angle and length.

Conclusions:

  • Driver speed behavior upon curve entry is variable and non-constant.
  • Findings offer insights for safer freeway curve design and traffic safety assessment based on real-world speed data.