Analysis of Traffic Volume and Travel-Time Relationship Using Continuous One-Hour Values on Urban Expressway

Table 1

Hourly travel time prediction models.

No.	Hourly travel-time prediction models (T8)						Maximum travel-timemodel during peak hours
	Model 1		Model 2		Model 3		Model 4
Term	Estimates	tratio	Estimates	tratio	Estimates	tratio	Estimates	tratio
Intercept	3.23	22.8	2.3	31.6	2.87	26	3.13	27.1
T7-Y7 (min)	—	—	1.03	13.0	1.19	16.61	1.234	12.81
Takatsuji on-ramp volume^5 in 7 am (veh/hour)	5.71E − 13	13.1	2.74E − 13	7.5	—	—	2.92E − 13	6.57
(Takatsuji on-ramp volume ⁺mainline volume)^5 in 7 am (veh/hour)	—	—	—	—	2.1E − 18	6.61	—	—
R square	0.578		0.821		0.807		0.804
Number of data	128		128		128		128

First 5 in the table means the fifth power of (Takatsuji on-ramp volume). The + in the table means the addition of (Takatsuji on-ramp volume) and (mainline volume). Next 5 in the table means the fifth power of (Takatsuji on-ramp volume plas mainline volume). means 1% significant.