Upload
hester-cooper
View
219
Download
0
Embed Size (px)
Citation preview
Iowa Statewide Travel Demand Model A Status Report
Paul HershkowitzWilbur Smith Associates
Dane IsmartThe Louis Berger Group
Mary LupaWilbur Smith Associates
Phil MescherIowa DOT, Office of Systems Planning
February 20, 2008
MTMUG Presentation
Purpose of Today’s Presentation
Review the two phases of the Iowa STM
Discuss the key purposes of the Iowa STM
Outline the findings of the architecture step
Provide a status report on key model elements (see next slide)
Obtain your feedback
Iowa STM Model Elements
Traffic Analysis Zones (Internal) geography
Buffer Zones (External) geography
Network
Socioeconomic Forecasts
Trucks
Phases I and II Work Flow
• Phase I developed the Iowa Statewide Model Framework for Phase II
Think “blueprint”
• Phase II is building the Iowa Statewide Model
$
$
$
$ ?
$
$
$$
$
$
$
$
$
$
$
$
$
$
OMAHA
DES MOINES
CEDAR RAPIDS
DAVENPORT
SIOUX CITY
ROCHESTER
WATERLOO
IOWA CITY
DUBUQUE
LA CROSSE
AMES
MOLINE
QUINCY
GALESBURG
BELLEVUE
35
90
80
90
80
29
35
90
29
74
380
280
94
235
80
88
0 10 20 30
Miles
IOWA
Phase II Work Flow
Two parts of Phase II:
Part 1 – Construction of Iowa STM using the Architecture “blueprint” (began October 15, 2007)
Part 2 – Commodity Flow Model Component (TBD)
Iowa DOT’s Actions supported the STM
• Assembled a team of internal and external transportation specialists
• Established a technical steering team – the EPSC – Executive Planning Steering Committee, which includes MPO representatives
• Set up a cooperative hands-on workshop program for TAZ, network, and centroid tasks with both DOT and consultant members
• Launched the effort formally in October 2007
Iowa STM Model ElementsApproach & Status
Traffic Analysis Zones (Internal) geography
Buffer Zones (External) geography
Network
Socioeconomic Forecasts
Trucks
Zone System Scales
A “telescoping” size approach to the zone systems is being used.
7
9615
23
1
9922
3
99
23
54
23100
32
3
9114 8
97
9
37
8
3
1619 96
37
98
21
14
48
1540 96
10 32
22
81
296
16
53 54
95
68
19 39
7
50
15
65
16
10
17
33
16 1542
92
1
33
7
3
45
66
1
20
10
100
3
100
3819
3
70
29
85
59
75
1
32
10
3
10
3
100
16
9
78
3
71
41
7943
12 9615
61
3384
25
46
83
65
38
10
96
50 6947
16
17
29
15
14
3
64
6
102
9 31
24
13
33
45
361
59
7
34
2937
4375
52
19
20
96
71
39
27
7365
60
79
8186
40
70
90
76
65
98
5
97
30
30
5
103
7726
63
106
1
4123
44
79
10
29
61
94
8234
31
5594
106
92
12
19
52
30
20
3 94
18
56
101
41
338
31
20
33
33
35
49
33
9719
52
106
66
9
23
99
17
55
2142
95
20
32
94
3
21
7120
100
43
30
60
37
42
12
9
42
3
7
24
42
8
56
47
2
20
78
43
38
72
75
4665
2
105
29
104
41
2167
95
105
28 93
90
78
923
4699
95
1088
333
79
99
6899
4
21 52
8334
65
96
59
10
30
28
18
14
6
1746
71
21
29
41
6063
7
32
18
1
72
19
62
101
942
4516
101
25
8260
56
89
2
51
56
65 96
9594
85
92
8
562 29
9
4
59
7
30
60
30
43
61
7
876059 60
1
6490
77
99
73
86
1
38
6575
3433
45
6038
54
35
91
103
48
28
65
36 55
55
10
7 3636
87
3
97
1
54
38
55
75
56
64
36
44
96
2994
97
76
58
53
92
6259
58
51
87
70
41
30 5858
41
29
75
8230
28 55
34
36
64
32
59 59
76
98
3
98
5326
60
39
553
33
9
3 8
80
2
50
1 94
33 84
105
6
14
20
99
3
94
23
30
3
8 60
16
567
16
57
17
33
17
7
23
59
1
24
54
104
17
84
3
30
3239
31
91
55
23
55
79
3
85
7
70
10
29
47
7 88
1
3
96
39
712023
3
1
10
7
5299
16
9
3
73
31
32
99
Traffic Analysis Zones (Internal)- Before TAZ Aggregation
Traffic Analysis Zones (Internal) After TAZ Aggregation
Sample of Buffer and National Zone System (External)
“Buffer” Zones
Iowa Highway Network (Internal)
Network congruence is desired with the Iowa Road database - GIMS (Geographic Information Management System)
The Iowa DOT is reviewing the GIMS for connectivity, and assignability prior to formal network development
There is an opportunity to interface with the Iowa DOT LRS road file product under development in 2008.
Much work ahead of us.
Highway Network (External)
Begin with National Highway Network or FAF2.2 Highway network
Adjust to the buffer TAZ system with telescoping scale
Collect traffic counts at Iowa portals, both land and bridges.
Sample of Buffer and National Network (External)
Socioeconomic Forecasts
Data Sources Internal TAZ
Population - from 2000 Census with growth trends from REMI or Woods & Poole
Employment - from Iowa Workforce Development with growth trends from REMI or Woods & Poole
MPOs will assist the Iowa DOT on obtaining congruency of forecast totals in their areas
TAZs within Iowa will be scaled towards the micro size (small).
Population - from 2000 Census with growth trends from Woods & Poole
Employment - from Woods and Poole with growth trends from Woods & Poole
MPOs will provide SE data for the portions of MPOs outside of Iowa.
TAZs outside Iowa will be scaled larger than those within the state.
Data Sources External TAZ
REMI in Iowa
• Used statewide since 1991
• Custom developed by REMI on fixed Iowa districts
• Contains population & total employment
• 1990 to 2050 by one-year increments
• Run by the Office of Program Management in the Planning, Programming and Modal Division
• Used by Iowa DOT for two highway corridor studies: US 63 from Waterloo to the Twin Cities US 20 from Fort Dodge to Sioux City
Current REMI Districts
• Five Des Moines counties individually (yellow)
• Eight MPO counties as a unit (green)
• Remainder of Iowa (gray)
SE Challenge
• REMI estimates are locally derived providing the best overall fit to Iowa conditions
• How to solve the “eight in one” city/county problem?
Sioux City, Council Bluffs, Ames, Waterloo, Cedar Rapids, Iowa City, Dubuque and Davenport are forecast as a group.
Iowa Truck Flows
Estimated Iowa Daily Truck Traffic
Source: FHWA
Iowa Total Domestic Truck Flows
Source: FHWA
Trucks
Iowa DOT wanted the most recent national and state data
The new Freight Analysis Framework (FAF2) freight data will be used for national truck flow information to/from and through Iowa.
FAF2 Districts
Comments and
Questions?