Journal
THEORETICAL AND APPLIED MECHANICS LETTERS
Volume 11, Issue 4, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.taml.2021.100283
Keywords
Tunnel effects; Travel time; Density threshold; Ramp effects
Categories
Funding
- National Natural Science Foun-dation of China [11972341]
Ask authors/readers for more resources
A macroscopic urgent-gentle class traffic model was proposed to explore tunnel effects on ring road traffic flow, which deepens the understanding of tunnel effects on traffic flow in reality.
To explore tunnel effects on ring road traffic flow, a macroscopic urgent-gentle class traffic model is put forward. The model identifies vehicles with urgent and gentle classes, chooses the tunnel speed limit as free flow speed to express the fundamental diagram in the tunnel, and adopts algebraic expressions to describe traffic pressure and sound speed. With two speed trajectories at the Kobotoke tunnel in Japan, the model is validated, with good agreement with observed data. Numerical results indicate that in the case of having no ramp effects, tunnel mean travel time is almost constant dependent on tunnel length. When initial density normalized by jam density is above a threshold of about 0.21, a traffic shock wave originates at the tunnel entrance and propagates backward. Such a threshold drops slightly as a result of on-ramp merging effect, the mean travel time drops as off-ramp diversion effect intensifies gradually. These findings deepen the understanding of tunnel effects on traffic flow in reality. (C) 2021 The Author(s). Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available