Driving comfort and dangerous driving behavior on helical ramp of interchange

• 1、School of Traffic and Transportation, Chongqing Jiaotong University, Chongqing 400074, China
• 2、Chongqing Rail Transit (Group) Co., Ltd, Chongqing 400000, China
• 3、Chongqing City Transportation Development & Investment Group Co., Ltd, Chongqing 404100, China
• 4、Chongqing Key Laboratory of

Abstract：In order to study the driving comfort and dangerous driving behavior of the high and overhead helical interchange ramp, the speed and longitudinal/lateral acceleration data of the passenger car were collected through the field operational test on Sujiaba interchange in Chongqing. The peak interval distribution, characteristic quantile value and other characteristics of the longitudinal/lateral acceleration were analyzed and used to evaluate the driving comfort of helical ramps. At the same time, the G-G diagram method was introduced to identify dangerous driving behaviors. The results show that the driver\'s braking deceleration distribution interval is greater than the driving acceleration. The lateral acceleration remains basically constant, and the dispersion of the lateral acceleration of the upward ramp is greater than that of the downward ramp. The longitudinal driving comfort of the helical ramp is good, while the lateral driving comfort is poor, and up to 72.4% of the drivers feel uncomfortable in the lateral direction. Dangerous driving behavior is positively correlated with lateral acceleration. The research results can provide basis for ramp alignment design, operating speed model calibration and traffic operation management.

Keywords： interchange field operational test helical ramp lateral（longitudinal）acceleration dangerous driving behavior