为研究互通立交匝道曲线段驾驶人心理负荷特性，在重庆市一处高密度互通立交群开展了38名被试的实车驾驶试验，使用PhysioLAB生理仪采集驾驶人在立交匝道曲线段的心电数据。以3种典型匝道作为研究对象，基于心率HR、心率增长率HRI和心率变异性［相邻正常心动周期差值的均方根（RMSSD）、全部窦性心搏RR间期的标准差（SDNN）］指标，建立因子分析模型，分析驾驶人在不同形式匝道曲线段的心理负荷变化规律以及影响因素。结果表明：驾驶人在不同匝道场景下的心率均值集中在60 ~ 120次／min，心率增长率在3% ~ 15%。驾驶人在右转匝道的心理负荷分布较分散，左转和环形匝道的心理负荷值分布较集中，环形匝道下心理负荷更高；不同驾驶风格和性别驾驶人的心理负荷存在差异，左转匝道对女性驾驶人影响更大，右转匝道对愤怒型驾驶人影响更大；心理负荷随道路环境熟悉程度增加而减小，随转弯角度增大而增大；匝道车道数增加导致车辆交织频繁，心理负荷增加。驾驶人心理负荷与右转匝道半径呈负相关，与左转匝道与环形匝道无线性关系，连续环形匝道行驶会增加心理负荷。

To investigate the psychological load characteristics of drivers on interchange ramp curves, an naturalistic driving test was conducted with 38 participants in a high-density interchange group in Chongqing. The PhysioLAB physiological monitoring system was used to collect electrocardiogram (ECG) data from drivers navigating the ramp curves. Three typical ramps were taken as research objects, a factor analysis model was established based on heart rate (HR), heart rate increment (HRI), and heart rate variability[root mean square of the difference between adjacent normal cardiac cycles(RMSSD) and standard deviation of RR intervals for all sinus heartbeats(SDNN)] to analyze the variations in psychological load and influencing factors for drivers on different ramp curves. The results indicate that the average heart rate for drivers on various ramp scenarios is found to range from 60 to 120 beats per minute, with heart rate increments between 3% and 15%. Psychological load on right-turn ramps is more dispersed, while on left-turn and circular ramps, it is more concentrated, with higher load observed on circular ramps. Differences in psychological load are noted among drivers of different styles and genders. Left-turn ramps impact female drivers more, and right-turn ramps impact aggressive drivers more. Psychological load decreases with increased familiarity and increases with larger turning angles. More ramp lanes lead to more vehicle weaving, increasing psychological load. A negative correlation is observed between psychological load and the radius of right-turn ramps, with no linear relationship for left-turn and circular ramps. Driving on consecutive circular ramps increases psychological load.