How accurate is the regional travel demand model in mimicking real-world travel times?

Figures & data

Figure 1. Links considered for the analysis.

Figure 2. Distribution of the selected links by the speed limit.

Figure 3. Distribution of the selected links by the area type.

Table 1. Mean and standard deviation by time of the day – all links.

Measure	Morning Peak		Mid-day		Evening Peak		Night-time
	Mean	Std. Dev.	Mean	Std. Dev.	Mean	Std. Dev.	Mean	Std. Dev.
TT	2.18	1.62	2.02	1.42	2.15	1.92	1.39	1.04
MinTT	1.12	0.82	1.09	0.80	0.99	0.90	0.93	0.81
TT05	1.46	1.00	1.48	1.00	1.36	1.11	1.26	1.05
TT10	1.53	1.03	1.54	1.02	1.43	1.14	1.32	1.08
TT15	1.58	1.04	1.58	1.04	1.48	1.16	1.36	1.10
TT25	1.65	1.07	1.65	1.06	1.56	1.20	1.42	1.12
AvgTT	1.92	1.19	1.85	1.12	1.85	1.33	1.59	1.17
TT50	1.82	1.14	1.78	1.10	1.74	1.28	1.53	1.16
TT75	2.05	1.28	1.96	1.16	2.00	1.43	1.67	1.22
TT85	2.25	1.41	2.10	1.22	2.20	1.55	1.79	1.27
TT90	2.41	1.54	2.23	1.27	2.39	1.65	1.90	1.31
TT95	2.73	1.73	2.47	1.36	2.72	1.85	2.12	1.41
MaxTT	8.47	5.61	8.87	5.39	8.81	6.21	7.92	5.89

TT is estimated travel time from the regional travel demand model. All others are computed from the private data source.

Table 2. Mean and standard deviation by time of the day and speed limit.

Speed Limit	Measure	Morning Peak		Mid-day		Evening Peak		Night-time
		Mean	Std. Dev.	Mean	Std. Dev.	Mean	Std. Dev.	Mean	Std. Dev.
>50 mph	TT	1.08	0.86	0.97	0.69	1.15	0.88	0.93	0.62
	MinTT	0.83	0.53	0.83	0.53	0.83	0.54	0.82	0.52
	TT05	0.89	0.58	0.89	0.58	0.90	0.59	0.88	0.56
	TT10	0.90	0.59	0.90	0.59	0.92	0.61	0.90	0.58
	TT15	0.92	0.60	0.91	0.60	0.93	0.62	0.91	0.58
	TT25	0.94	0.62	0.93	0.61	0.96	0.64	0.93	0.60
	AvgTT	1.09	0.97	0.98	0.66	1.17	0.79	0.98	0.63
	TT50	1.02	0.79	0.96	0.63	1.06	0.71	0.97	0.62
	TT75	1.16	1.27	1.00	0.67	1.25	0.93	1.00	0.65
	TT85	1.26	1.60	1.03	0.72	1.40	1.09	1.02	0.67
	TT90	1.35	1.97	1.07	0.78	1.52	1.23	1.04	0.69
	TT95	1.49	2.25	1.13	0.91	1.75	1.49	1.08	0.73
	MaxTT	10.61	10.47	9.43	8.89	10.76	8.43	11.78	9.97
>40 & ≤50 mph	TT	2.55	1.75	2.35	1.52	2.82	2.04	1.73	1.02
	MinTT	1.30	0.88	1.27	0.87	1.32	0.90	1.27	0.85
	TT05	1.69	1.07	1.70	1.06	1.75	1.09	1.63	1.04
	TT10	1.76	1.10	1.77	1.09	1.84	1.12	1.70	1.06
	TT15	1.81	1.11	1.81	1.10	1.90	1.14	1.75	1.08
	TT25	1.89	1.14	1.88	1.12	1.99	1.17	1.81	1.10
	AvgTT	2.18	1.26	2.10	1.18	2.32	1.29	2.00	1.15
	TT50	2.06	1.21	2.01	1.16	2.18	1.25	1.93	1.14
	TT75	2.32	1.33	2.20	1.22	2.48	1.38	2.09	1.18
	TT85	2.53	1.44	2.36	1.27	2.72	1.50	2.22	1.21
	TT90	2.71	1.54	2.49	1.32	2.93	1.60	2.34	1.25
	TT95	3.05	1.73	2.75	1.40	3.31	1.79	2.59	1.32
	MaxTT	8.80	4.82	9.24	4.74	9.98	5.82	8.76	5.61
≤ 40 mph	TT	1.67	1.09	1.59	1.01	1.82	1.26	1.30	0.77
	MinTT	0.78	0.55	0.76	0.53	0.79	0.56	0.78	0.54
	TT05	1.12	0.73	1.14	0.74	1.17	0.77	1.09	0.70
	TT10	1.19	0.75	1.21	0.76	1.25	0.80	1.15	0.72
	TT15	1.25	0.77	1.26	0.78	1.31	0.81	1.20	0.74
	TT25	1.33	0.79	1.33	0.79	1.40	0.84	1.26	0.76
	AvgTT	1.59	0.86	1.57	0.85	1.71	0.95	1.49	0.79
	TT50	1.50	0.84	1.49	0.83	1.60	0.91	1.41	0.79
	TT75	1.72	0.91	1.70	0.89	1.87	1.03	1.59	0.83
	TT85	1.90	0.97	1.85	0.93	2.09	1.14	1.74	0.87
	TT90	2.06	1.04	2.00	0.99	2.28	1.22	1.88	0.91
	TT95	2.36	1.15	2.27	1.07	2.62	1.37	2.16	1.01
	MaxTT	6.91	4.53	7.76	5.13	8.12	5.59	7.01	3.85

TT is estimated travel time from the regional travel demand model. All others are computed from the private data source.

Table 3. Mean and standard deviation by time of the day and area type.

Area Type	Measure	Morning Peak		Mid-day		Evening peak		Night-time
		Mean	Std. Dev.	Mean	Std. Dev.	Mean	Std. Dev.	Mean	Std. Dev.
CBD	TT	0.98	0.52	0.93	0.47	1.06	0.56	0.82	0.40
	MinTT	0.41	0.21	0.40	0.21	0.42	0.21	0.42	0.21
	TT05	0.65	0.34	0.65	0.33	0.66	0.34	0.63	0.33
	TT10	0.72	0.38	0.72	0.37	0.73	0.38	0.69	0.37
	TT15	0.76	0.41	0.76	0.39	0.78	0.41	0.74	0.39
	TT25	0.85	0.45	0.85	0.44	0.88	0.46	0.80	0.43
	AvgTT	1.10	0.54	1.08	0.53	1.17	0.56	1.05	0.52
	TT50	1.04	0.54	1.03	0.54	1.08	0.56	0.96	0.52
	TT75	1.25	0.63	1.22	0.63	1.33	0.66	1.16	0.60
	TT85	1.40	0.71	1.36	0.68	1.52	0.75	1.32	0.69
	TT90	1.54	0.78	1.49	0.73	1.68	0.80	1.48	0.77
	TT95	1.82	0.89	1.73	0.83	2.00	0.92	1.75	0.91
	MaxTT	5.59	2.89	6.50	3.43	6.32	3.13	6.73	3.87
Fringe	TT	1.81	1.13	1.72	1.07	2.02	1.32	1.30	0.73
	MinTT	0.85	0.51	0.83	0.50	0.87	0.51	0.83	0.49
	TT05	1.17	0.69	1.20	0.70	1.25	0.73	1.11	0.65
	TT10	1.24	0.72	1.27	0.73	1.33	0.78	1.18	0.68
	TT15	1.29	0.75	1.31	0.76	1.39	0.80	1.23	0.70
	TT25	1.37	0.78	1.38	0.78	1.48	0.84	1.29	0.73
	AvgTT	1.61	0.90	1.61	0.89	1.83	1.01	1.48	0.80
	TT50	1.52	0.86	1.53	0.85	1.69	0.95	1.41	0.78
	TT75	1.74	0.98	1.73	0.96	2.01	1.12	1.57	0.85
	TT85	1.91	1.07	1.89	1.04	2.26	1.25	1.70	0.92
	TT90	2.06	1.15	2.03	1.12	2.47	1.36	1.82	0.98
	TT95	2.34	1.29	2.28	1.25	2.87	1.58	2.05	1.09
	MaxTT	7.29	4.05	8.99	5.85	10.20	6.42	8.42	5.49
Urban	TT	2.47	1.68	2.30	1.46	2.72	1.94	1.70	0.97
	MinTT	1.23	0.78	1.19	0.75	1.24	0.79	1.19	0.74
	TT05	1.61	0.97	1.62	0.97	1.68	1.00	1.56	0.94
	TT10	1.69	1.00	1.69	0.99	1.76	1.04	1.63	0.97
	TT15	1.74	1.02	1.73	1.01	1.82	1.06	1.67	0.99
	TT25	1.82	1.06	1.80	1.04	1.91	1.10	1.74	1.01
	AvgTT	2.13	1.21	2.01	1.10	2.24	1.23	1.93	1.06
	TT50	2.00	1.14	1.93	1.08	2.11	1.18	1.85	1.04
	TT75	2.28	1.33	2.12	1.15	2.42	1.34	2.01	1.09
	TT85	2.50	1.49	2.27	1.20	2.66	1.47	2.15	1.14
	TT90	2.70	1.65	2.41	1.26	2.87	1.57	2.27	1.18
	TT95	3.05	1.87	2.66	1.34	3.23	1.78	2.52	1.27
	MaxTT	9.65	6.30	9.32	5.46	10.29	6.47	9.09	6.32
Suburban & Rural	TT	2.54	1.91	2.27	1.63	2.79	2.25	1.81	1.14
	MinTT	1.53	1.02	1.52	1.02	1.56	1.05	1.52	1.00
	TT05	1.86	1.23	1.87	1.23	1.90	1.26	1.81	1.20
	TT10	1.91	1.26	1.92	1.26	1.96	1.29	1.87	1.23
	TT15	1.95	1.28	1.95	1.28	2.00	1.31	1.91	1.24
	TT25	2.01	1.30	2.00	1.29	2.06	1.33	1.97	1.27
	AvgTT	2.22	1.42	2.16	1.36	2.30	1.45	2.11	1.32
	TT50	2.14	1.37	2.09	1.33	2.19	1.40	2.06	1.31
	TT75	2.30	1.46	2.22	1.39	2.40	1.53	2.17	1.36
	TT85	2.46	1.58	2.32	1.43	2.57	1.64	2.26	1.39
	TT90	2.60	1.70	2.42	1.48	2.73	1.73	2.35	1.42
	TT95	2.88	1.90	2.63	1.58	3.04	1.93	2.54	1.50
	MaxTT	8.54	5.73	8.90	5.24	8.87	5.45	8.52	6.08

TT is estimated travel time from the regional travel demand model. All others are computed from the private data source.

Figure 4. Scatter plots for the links with speed limit > 50 mph by time of the day.

Figure 5. Scatter plots for the links with speed limit > 40 & ≤ 50 mph by time of the day.

Figure 6. Scatter plots for the links with speed limit >30 & ≤40 mph by time of the day.

Figure 7. Pearson correlation coefficients – for all links.

Figure 8. Pearson correlation coefficients – for links with speed limit >50 mph.

Figure 9. Pearson correlation coefficients – for links with speed limit >40 & ≤ 50 mph.

Figure 10. Pearson correlation coefficients – for links with speed limit >30 & ≤40 mph.

Figure 11. Pearson correlation coefficients by area type.