Investigating Micro-Driving Behavior of Combined Horizontal and Vertical Curves Using an RF Model and SHAP Analysis
Abstract
:1. Introduction
2. Literature Review
2.1. Geometric Design and Safety
2.2. Combined Curves’ Geometric Design and Micro-Driving Behaviors
3. Data Preparation
3.1. Geometric Data
3.2. Micro-Driving Behavior Data Collection
4. Micro-Driving Behavior
4.1. Speed Change Behavior
4.2. Lane Departure Behavior
4.3. Micro-Behavior Comparison of Four Combined Curves
5. Shapley Explanation for the Relationship between Micro-Behavior and Geometric Design
5.1. Methodology
5.1.1. Random Forest
5.1.2. SHAP
5.2. RF-SHAP Analysis of Mirco-Behavior on Combined Curves
5.2.1. Speed Change Behavior on Downslope and Sag Curve
- (1)
- Downslope Curve
- (2)
- Sag Curve
5.2.2. Lane Departure Behavior on Downslope, Upslope, and Crest Curves
- (1)
- Downslope Curve
- (2)
- Upslope Curve
- (3)
- Crest Curve
6. Discussion
- Selecting key safety evaluation measures.
- Ranking of geometric design parameters of combined curves.
- Optimizing design based on safety evaluation measures.
7. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Continuous Variable | |||||
---|---|---|---|---|---|
Variables | Description | Mean | S.D. | Min | Max |
Mean slope of combined curve | −2.23 | 2.39 | −5.25 | 5.25 | |
Slope differential of maximum and minimum slope | 2.86 | 1.93 | 0.00 | 8.10 | |
Length of combined curve | 413.97 | 135.35 | 222.51 | 790.76 | |
Length of circular curve | 211.13 | 122.64 | 35.00 | 490.76 | |
Length of approach transition | 101.10 | 25.30 | 0.00 | 160.00 | |
Length of departure transition | 101.74 | 25.08 | 0.00 | 155.00 | |
Radius of combined curve | 821.56 | 447.23 | 400.00 | 2500.00 |
Variables | Description | Mean | S.D. | Min | Max |
---|---|---|---|---|---|
1 | The preceding curvature change | 0.00079 | 0.00048 | 0.00004 | 0.0020 |
2 | The slope change of the preceding section | 3.45 | 3.57 | 0.00 | 12.00 |
3 | The following curvature change | 0.00079 | 0.0005 | 0.00005 | 0.0024 |
4 | The slope change of the following section | 1.93226 | 1.93277 | 0.00 | 9.00 |
Curve | Minimum Value | Maximum Value | S.D. | 7.5th Percentile Value | 92.5th Percentile Value |
---|---|---|---|---|---|
Downslope | −39.96 | 42.30 | 11.98 | −15.17 | 17.94 |
Upslope | −41.88 | 29.57 | 9.71 | −14.49 | 12.80 |
Sag | −32.32 | 40.24 | 13.53 | −17.83 | 19.91 |
Crest | −35.03 | 42.53 | 11.12 | −17.48 | 12.59 |
Type | Mean (m) | Max (m) | Min (m) | S.D (m) | |
---|---|---|---|---|---|
IDCF lane departure | Maximum lateral departure | 0.81 | 1.10 | 0.01 | 0.29 |
Departure persistence distance | 72.75 | 500 | 5 | 70.48 | |
ADCF lane departure | Maximum lateral departure | 0.36 | 1.52 | 0.00 | 0.35 |
Departure persistence distance | 60.64 | 410 | 5 | 61.93 |
Road Type | Speed Change | Lane Departure |
---|---|---|
Upslope curve | 4.436 | 19.753 |
Downslope curve | 15.884 | 41.114 |
Crest curve | 8.435 | 12.482 |
Sag curve | 5.111 | 2.203 |
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Wang, X.; Wei, X.; Wang, X. Investigating Micro-Driving Behavior of Combined Horizontal and Vertical Curves Using an RF Model and SHAP Analysis. Appl. Sci. 2024, 14, 2369. https://doi.org/10.3390/app14062369
Wang X, Wei X, Wang X. Investigating Micro-Driving Behavior of Combined Horizontal and Vertical Curves Using an RF Model and SHAP Analysis. Applied Sciences. 2024; 14(6):2369. https://doi.org/10.3390/app14062369
Chicago/Turabian StyleWang, Xiaomeng, Xuanzong Wei, and Xuesong Wang. 2024. "Investigating Micro-Driving Behavior of Combined Horizontal and Vertical Curves Using an RF Model and SHAP Analysis" Applied Sciences 14, no. 6: 2369. https://doi.org/10.3390/app14062369