Table 7. Relative importance of each...

Table 7.

Relative importance of each variable and their ranks in the RF model

Variable	Definition	Relative importance (%)	Rank
ID	Road segment ID	2.28	7
L	Length of the road segment	0.17	23
Speed	Space mean speed	10.59	3
TOD	TOD is indexed from 1 to 96, which represent the time from 0:00–24:00 by every 15 min timestep	30.12	2
DOW	DOW is indexed from 1 to 7, which represent from Monday through Sunday	2.84	5
Month	The month is indexed 1 to 12, which represent from January to December	1.59	8
Weather	Weather is indexed from 1 to 3, which represent normal, rain and snow/ice/fog	2.63	6
T_t₋₁	The travel time at prediction segment 15 min before	34.85	1
T_t₋₂	The travel time at prediction segment 30 min before	0.57	11
T_t₋₃	The travel time at prediction segment 45 min before	0.28	18
T_t₋_w	The travel time at prediction segment one week before	9.87	4
ΔT_t₋₁	The ravel time change value at T_t−1	0.24	19
ΔT_t₋₂	The ravel time change value at T_t−2	0.20	21
ΔT_t₋₃	The travel time change value at T_t−3	0.18	22
ΔT_t₋_w	The travel time change value at T_t−w	0.22	20
$T_{t - 1}^{i - 1}$	The travel time of the nearest upstream road segment 15 min before	0.31	15
$T_{t - 1}^{i - 2}$	The travel time of the second nearest upstream road segment 15 min before	0.42	12
$Δ T_{t - 1}^{i - 1}$	The travel time change value at the nearest upstream road segment 15 min before	0.29	16
$Δ T_{t - 1}^{i - 2}$	The travel time change value at the second nearest upstream road segment 15 min before	0.29	16
$\begin{array}{l} T_{t - 1}^{i + 1} \end{array}$	The travel time of the nearest downstream road segment 15 min before	0.35	14
$T_{t - 1}^{i + 2}$	The travel time of the second nearest downstream road segment 15 min before	0.61	10
$Δ T_{t - 1}^{i + 1}$	The travel time change value at the nearest downstream road segment 15 min before	0.79	9
$Δ T_{t - 1}^{i + 2}$	The travel time change value at the second nearest downstream road segment 15 min before	0.37	13

Variable	Definition	Relativeimportance (%)	Rank
ID	Road segment ID	2.28	7
L	Length of the road segment	0.17	23
Speed	Space mean speed	10.59	3
TOD	TOD is indexed from 1 to 96, which represent the time from 0:00–24:00 by every 15 min timestep	30.12	2
DOW	DOW is indexed from 1 to 7, which represent from Monday through Sunday	2.84	5
Month	The month is indexed 1 to 12, which represent from January to December	1.59	8
Weather	Weather is indexed from 1 to 3, which represent normal, rain and snow/ice/fog	2.63	6
T_t₋₁	The travel time at prediction segment 15 min before	34.85	1
T_t₋₂	The travel time at prediction segment 30 min before	0.57	11
T_t₋₃	The travel time at prediction segment 45 min before	0.28	18
T_t₋_w	The travel time at prediction segment one week before	9.87	4
ΔT_t₋₁	The ravel time change value at T_t−1	0.24	19
ΔT_t₋₂	The ravel time change value at T_t−2	0.20	21
ΔT_t₋₃	The travel time change value at T_t−3	0.18	22
ΔT_t₋_w	The travel time change value at T_t−w	0.22	20
$T_{t - 1}^{i - 1}$	The travel time of the nearest upstream road segment 15 min before	0.31	15
$T_{t - 1}^{i - 2}$	The travel time of the second nearest upstream road segment 15 min before	0.42	12
$Δ T_{t - 1}^{i - 1}$	The travel time change value at the nearest upstream road segment 15 min before	0.29	16
$Δ T_{t - 1}^{i - 2}$	The travel time change value at the second nearest upstream road segment 15 min before	0.29	16
$\begin{array}{l} T_{t - 1}^{i + 1} \end{array}$	The travel time of the nearest downstream road segment 15 min before	0.35	14
$T_{t - 1}^{i + 2}$	The travel time of the second nearest downstream road segment 15 min before	0.61	10
$Δ T_{t - 1}^{i + 1}$	The travel time change value at the nearest downstream road segment 15 min before	0.79	9
$Δ T_{t - 1}^{i + 2}$	The travel time change value at the second nearest downstream road segment 15 min before	0.37	13

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