In India, traffic conditions are complex in nature as mixed traffic condition prevails with lane indiscipline. Thus, the behavior of a driver is highly unpredictable and depends on the vehicle condition, passenger, and road condition. The lateral movement of vehicles is a very common phenomenon due to lane indiscipline. Vertical curves of the road are mainly designed to accommodate variations in the alignment’s grade. On vertical curves due to frequent acceleration and deceleration of the vehicles, it becomes difficult to estimate the lateral movement and speed characteristics of the vehicle. Thus, the study of driver’s behavior on vertical curves is necessary for enhancing the geometry of the curve and reducing the number of accidents. The present study seeks to determine the speed and lateral movement characteristics of vehicles and analyze the driver’s behavior on a vertical curve road geometry having a combination of both summit and valley curves. Also, the variation in lateral shift and heading angle for different vehicle category and their relation with longitudinal speed was explored. For the same, videographic data was collected using drones at two sites in Nagpur, Maharashtra. The result showed that the side friction has an impact on lateral movement and speed reduction. Thus, the study suggests that while designing vertical curves, the lateral movement of vehicles and the impact of side friction along with speed reduction needs to be taken into consideration. This will lead to improvement in the capacity and lane discipline of the vehicles on roads.

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Study of Lateral Movement Characteristics of Vehicle on Vertical Curves in Mixed Traffic Condition

  • Pratik Deshmukh,
  • Pratik Khatkar,
  • Arpita Saha

摘要

In India, traffic conditions are complex in nature as mixed traffic condition prevails with lane indiscipline. Thus, the behavior of a driver is highly unpredictable and depends on the vehicle condition, passenger, and road condition. The lateral movement of vehicles is a very common phenomenon due to lane indiscipline. Vertical curves of the road are mainly designed to accommodate variations in the alignment’s grade. On vertical curves due to frequent acceleration and deceleration of the vehicles, it becomes difficult to estimate the lateral movement and speed characteristics of the vehicle. Thus, the study of driver’s behavior on vertical curves is necessary for enhancing the geometry of the curve and reducing the number of accidents. The present study seeks to determine the speed and lateral movement characteristics of vehicles and analyze the driver’s behavior on a vertical curve road geometry having a combination of both summit and valley curves. Also, the variation in lateral shift and heading angle for different vehicle category and their relation with longitudinal speed was explored. For the same, videographic data was collected using drones at two sites in Nagpur, Maharashtra. The result showed that the side friction has an impact on lateral movement and speed reduction. Thus, the study suggests that while designing vertical curves, the lateral movement of vehicles and the impact of side friction along with speed reduction needs to be taken into consideration. This will lead to improvement in the capacity and lane discipline of the vehicles on roads.