Manual Distribution

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Manual Distribution
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Trip Distribution/Assignment

• Analyzing where trips come from and go to in
  relation to development
• Results in a determination of traffic that will
  use each access point and route on the roadway
  network
• Total traffic
• Development traffic
• Non-development (background) traffic
• Manual methods most analysis estimate
  distribution and assignment at the same time

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Manual Methods

• Trip Attenuation Method
• Manual Gravity Model Calculations
• Analogy Method
• Market-Based Method

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You Start With Major Directions
12
6
40
15
17
10
6
Then You Distribute Trips To The Network
12
6
15
40
10
17
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Major Directions Decided
From Kimley Horn
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Distributions Can Change Over Time
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Distributions Can Change Over Time
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Trip Attenuation

• Assign site traffic according to turn percentages
• Reduce site volumes using attenuation factors to
  account for intervening opportunities for the
  trip to end

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Sources For Trip Length Frequency

• Travel Characteristics Survey
• FSUTMS (DISTRIB.OUT report)
• National Personal Transportation Survey (NPTS)

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Trip Attenuation Method
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Trip Distribution and Assignment
Example
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Distribution and AssignmentOffice
Professional Judgment
Office
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Distribution and AssignmentOffice
278
57
Trips Exiting
Trips Entering
23
17
Office
Trips Entering
Trips Exiting
84
Trips Entering
83
17
Trips Exiting
Trips Entering
19
Distribution and AssignmentOffice
278
57
Trips Exiting
Trips Entering
23
17
Office
Trips Entering
Trips Exiting
111
84
Trips Exiting
Trips Entering
83
17
Trips Exiting
Trips Entering
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Distribution and AssignmentOffice
Office
21
167 111
167
Office
111
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Assignment of office traffic to four driveways in
site plan
Office
23
980
167
Office
111
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Assignment
25
Assignment
980
167
Office
111
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SB Link 2 Volume 564 Background 612
Development 1,176 Total
NB Link 2 Volume 742
Background 780 1,258 62 Development
Traffic 1,522 Total
564
742
CR 48
SB Link 1 Volume 690 Background 987
Development 1,677 Total
NB Link 1 Volume 524 Background
1258 Development 1,782 Total
1258
Total Northbound Development Traffic
Background Traffic
690
524
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Assignment
NB Link 2 Volume 742
Background 780 1,258 62 Development
Traffic 1,522 Total
564
742
CR 48
NB Link 1 Volume 524 Background
1258 Development 1,782 Total
1258
Total Northbound Development Traffic
Background Traffic
690
524
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Distribution of Trips- Shopping

• From the Methodology Meeting
• Approved site plan with number (4) of planned
  driveway connections
• 3679 total trips exiting and entering from four
  driveway connections
• Approved upon percentages by applicant and FDOT
• 50
• 15
• 15
• 20

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Distribution of Trips- Shopping
To Interstate
50
Local Road
Local Road
3679
15
20
15
Local Road
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Distribution of Trips- Shopping
50
3679
15
20
15
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Directional Distribution of Office Trips in the
Evening

• 17 Entering
• 83 Exiting

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Distribution of Trips- Shopping
52
48
50
52
48
3679
20
15
48
52
15
52
48
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Distribution of Trips- Shopping
1850
893
957
52
48
50
52
48
354
286
3679
736
552
20
15
48
266
52
382
15
52
48
551
265
286
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Distribution of Trips- Apartment
70
23
47
67
33
30
67
33
39
19
58
232
58
25
25
39
33
67
19
20
67
33
46
31
15
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Distribution of Trips- Office
335
278
57
83
17
30
83
17
23
17
134
670
101
25
25
17
111
84
83
20
83
17
83
100
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