Modeling Impacts of Speed Reduction on Traffic Efficiency on Expressway Uphill Sections
Abstract
:1. Introduction
2. Methods
2.1. Variable Definition
2.2. Field Experiment
2.3. Data Processing
3. Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Section | Station | Slope (%) | Slope Length (m) | Radius (m) |
---|---|---|---|---|
1 | K33 + 100–K33 + 648 | 1.34 | 548 | 2600 |
2 | K39 + 217–K39 + 633 | 2.00 | 416 | 2460 |
3 | K40 + 600–K41 + 220 | 3.10 | 620 | 1175 |
4 | K43 + 250–K43 + 750 | 3.90 | 500 | ∞ |
5 | K51 + 620–K52 + 740 | 2.582 | 1120 | 1000 |
6 | K53 + 691–K54 + 341 | 4.50 | 650 | ∞ |
Number | Speed Reduction (km/h) | Average Speed (km/h) | Number of Vehicles (veh) | Number of Heavy Trucks (veh) |
---|---|---|---|---|
1 | 1.41 | 65.16 | 18 | 3 |
2 | 6.82 | 75.12 | 16 | 4 |
3 | 13.67 | 72.86 | 17 | 2 |
4 | 19.20 | 73.23 | 19 | 3 |
5 | 24.93 | 67.19 | 16 | 2 |
6 | 2.31 | 66.42 | 16 | 3 |
7 | 8.23 | 69.17 | 19 | 4 |
8 | 14.47 | 77.18 | 18 | 3 |
9 | 20.84 | 73.28 | 20 | 2 |
10 | 26.48 | 69.89 | 19 | 3 |
Number | Speed Reduction (km/h) | Average Speed (km/h) | Number of Vehicles (veh) | Number of Light Trucks (veh) |
---|---|---|---|---|
1 | 3.54 | 88.73 | 17 | 3 |
2 | 3.58 | 74.94 | 18 | 4 |
3 | 4.01 | 84.28 | 17 | 2 |
4 | 4.08 | 82.21 | 19 | 3 |
5 | 5.93 | 78.06 | 16 | 2 |
6 | 5.97 | 83.67 | 20 | 3 |
7 | 6.38 | 83.04 | 17 | 4 |
8 | 6.46 | 82.00 | 18 | 3 |
9 | 7.92 | 81.59 | 19 | 2 |
10 | 3.65 | 86.69 | 20 | 3 |
Model | Type | R2 | Sig. F | Constant | a | b | c |
---|---|---|---|---|---|---|---|
1 | Quadratic | 0.754 | 0.000 | 90036.718 | 6726.495 | −160.016 | — |
2 | Cubic | 0.803 | 0.000 | 71297.478 | 10759.106 | −364.327 | 2.852 |
Vertical Slope | Type | R2 | Regression Model |
---|---|---|---|
1.34% | Quadratic | 0.784 | E = 90653.756 + 6330.856 − 131.982 |
Cubic | 0.816 | E = 75339.487 + 9257.203 − 263.6372 + 1.6263 | |
2.00% | Quadratic | 0.775 | E = 93566.028 + 6040.980 − 133.8282 |
Cubic | 0.831 | E = 72926.802 + 10056.760 − 316.6542 + 2.2953 | |
2.582% | Quadratic | 0.754 | E = 90036.718 + 6726.495 − 160.0162 |
Cubic | 0.803 | E = 71297.478 + 10759.106 − 364.3272 + 2.8523 | |
3.10% | Quadratic | 0.744 | E = 92869 + 5383 − 1502 |
Cubic | 0.825 | E = 69325 + 10738 − 435.182 + 4.17313 | |
3.90% | Quadratic | 0.753 | E = 81717.693 + 8911.328 − 358.8722 |
Cubic | 0.840 | E = 60169.267 + 16389.945 − 963.4592 + 13.3113 | |
4.50% | Quadratic | 0.758 | E = 76791.458 + 11174.221 − 558.2242 |
Cubic | 0.824 | E = 57999.642 + 19379.605 − 1395.5872 + 23.2633 |
Design Speed (km/h) | 120 | 100 | 80 | 60 | 40 | 30 | 20 | |
---|---|---|---|---|---|---|---|---|
Vertical slope (%) | 3 | 900 | 1000 | 1100 | 1200 | — | — | — |
4 | 700 | 800 | 900 | 1000 | 1100 | 1100 | 1200 | |
5 | — | 600 | 700 | 800 | 900 | 900 | 1000 | |
6 | — | — | 500 | 600 | 700 | 700 | 800 | |
7 | — | — | — | — | 500 | 500 | 600 | |
8 | — | — | — | — | 300 | 300 | 400 | |
9 | — | — | — | — | — | 200 | 300 | |
10 | — | — | — | — | — | — | 200 |
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Zhang, X.; Xu, J.; Liang, Q.; Ma, F. Modeling Impacts of Speed Reduction on Traffic Efficiency on Expressway Uphill Sections. Sustainability 2020, 12, 587. https://doi.org/10.3390/su12020587
Zhang X, Xu J, Liang Q, Ma F. Modeling Impacts of Speed Reduction on Traffic Efficiency on Expressway Uphill Sections. Sustainability. 2020; 12(2):587. https://doi.org/10.3390/su12020587
Chicago/Turabian StyleZhang, Xiaodong, Jinliang Xu, Qianqian Liang, and Fangchen Ma. 2020. "Modeling Impacts of Speed Reduction on Traffic Efficiency on Expressway Uphill Sections" Sustainability 12, no. 2: 587. https://doi.org/10.3390/su12020587
APA StyleZhang, X., Xu, J., Liang, Q., & Ma, F. (2020). Modeling Impacts of Speed Reduction on Traffic Efficiency on Expressway Uphill Sections. Sustainability, 12(2), 587. https://doi.org/10.3390/su12020587