Calculation method of parallel-type acceleration lane length of urban expressway

LI Wen-quan; SHAO Zi-ke; WANG Shi-heng; SUN Chun-yang; ZHENG Le

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LI Wen-quan, SHAO Zi-ke, WANG Shi-heng, SUN Chun-yang, ZHENG Le. Calculation method of parallel-type acceleration lane length of urban expressway[J]. Journal of Traffic and Transportation Engineering, 2017, 17(4): 113-121.

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LI Wen-quan, SHAO Zi-ke, WANG Shi-heng, SUN Chun-yang, ZHENG Le. Calculation method of parallel-type acceleration lane length of urban expressway[J]. Journal of Traffic and Transportation Engineering, 2017, 17(4): 113-121.

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Calculation method of parallel-type acceleration lane length of urban expressway

1.
School of Transportation, Southeast University, Nanjing 210096, Jiangsu, China
2.
Department of Agriculture Mechanization, Nanyang Vocational College of Agriculture, Nanyang 473000, Henan, China

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Author Bio:
LI Wen-quan(1964-), male, professor, PhD, +86-25-83795647, wenqli@seu.edu.cn
Received Date: 2017-03-15
Publish Date: 2017-08-25

Abstract

Abstract

The differences of calculation methods of parallel-type acceleration lane length in Chinese and American current standards were compared. Kinematics model and acceptable gap model were combined, and a calculation model of parallel-type acceleration lane length of urban expressway was established on the basis of considering three kinds of influence factors, including mainline traffic level, initial velocity and variable gap. The model was solved by Monte Carlo method. The influence of three kinds of factors on the acceleration lane length was analyzed, and a determining method of acceleration lane length based on expected initial velocity and expected mainline traffic level was proposed. Analysis result shows that 3 factors have great influence on the acceleration lane length, and the minimum values of acceleration lane length in Specification for Design of Urban Expressway (CJJ 129—2009) are smaller than the simulation values at different design speeds. When the design speed is 100 km·h^-1, the upper and lower limits ofacceleration lane length under the third class service level are 27-36 mand 9-27 mlarger than the specified values, respectively. When the design speed is 80 km·h^-1, the upper and lower limits of acceleration lane length under the third class service level are 10-22 mand 4-24 mlarger than the specified values, respectively. When the design speed is 60 km·h^-1, the upper and lower limits of acceleration lane length under the third class service level are 15-24 mand 13-30 mlarger than the specified values, respectively. With the decrease of initial velocity, the acceleration lane length increases. Under the same condition, the acceleration lane length on the fourth critical gap function is maximum, and the value on the first critical gap function is minimum, which indicates that the larger the critical gap is, the longer the acceleration lane length is. The quadratic function fitting degrees of acceleration lane length and initial velocity are 0.865 8-0.999 7 at different design speeds under the third class service level, which indicates that the whole fitting result is good. Obviously, the calculation method of parallel-type acceleration lane length of urban expressway is reasonable and reliable.
- traffic planning,
- urban expressway,
- parallel-type acceleration lane,
- lane length,
- variable gap,
- third class service level

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References

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