Empirical Analysis of Traffic Bottleneck at Beijing Expressways

Table 1

The coefficient value of fitting functions on traffic flow parameters in congestion.

	1	2	3	4	5	6
Volume
𝐴𝑖	0.66	0.57	0.35	0.60	0.47	0.42
𝜔𝑖	0.08	0.13	0.21	0.25	0.46	0.50
𝜑𝑖	2.96	3.67	−0.23	3.56	2.56	1.21
𝑎	6.88		MRE		10.38%
Speed
𝐴𝑖	0.95	0.53	0.59	0.61	0.57	0.39
𝜔𝑖	0.08	0.13	0.21	0.25	0.46	0.50
𝜑𝑖	2.77	3.75	0.21	3.61	2.74	1.21
𝑎	4.70		MRE		12.09%
Occupancy
𝐴𝑖	0.08	0.03	0.03	0.03	0.04	0.03
𝜔𝑖	0.08	0.13	0.21	0.25	0.46	0.50
𝜑𝑖	−0.34	0.53	3.46	0.36	−0.21	4.54
𝑎	0.68		MRE		7.52%