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Studies Have Shown That Internal
Capture Rates Have Not Been As
High As Expected by Their Developers
Studies Have Shown That Internal
Capture Rates Have Not Been As
High As Expected by Their Developers
DevelopmentBoundary
Internal Capture Trips
• Some Developments Are So Large and Diverse That Trips Are Served Internally
Mixed-Use Developments
• Developments that contain two or more land use components
• Trip generation is calculated separately for each land use component
• Total development trip generation (external + internal) is determined by summing components
Internal Capture Considerations
• Residential and employment centers should be compatible (with respect to income levels) to allow internal capture
• On-site employment may not attract work trips from on-site homes for several years
• Remote projects may have higher internal capture
• Trips that cross or use the public road system cannot be subtracted with the internal trip component
Trip Internalization
• The ITE Handbook provides a worksheet for multi-use development trip generation and internal capture summary. (page 103 6th edition.)
Trip Internalization
• The ITE Handbook also provides typical demand rates for trip origins and destinations. (page 87-88 March 2001 edition.)
Think of this as the “push”
Think of this as the “pull”
Trip Internalization
• Note: Several land uses in the 6th edition retail classification (800-899) have been reclassified as ‘Services’ in the 7th edition. These land uses include banks, restaurants, and service stations.
Trip Internalization
• Problem #4– Using the land uses from problems 1 - 3 and
the trip origins/ destination rate from the ITE Handbook, what is the internal capture rate of the following development:
• a 200,000 f2 Shopping Center (ITE #820)• a 120,000 f2 Office (ITE #710)• a 200 f2 Single Family Home (ITE #221)
Shopping Center
820200,000 f2
General Office
720120,000 f2
Low Rise Apt
221200 Units
What is the total number of trips generated?200 K f2 X 4.945 = 989
989
What is the directional distribution of trips?65% entering, 35% exiting 989 X 0.48 = 475 entering898 X 0.52 = 514 exiting
475514
What is the total number of trips generated?1.20 K f2 X 1.775 = 213
What is the directional distribution of trips?
17% entering, 83% exiting 213 X 0.17 = 36 entering213 X 0.83 = 177 exiting
What is the total number of trips generated?200 DU X 0.62 = 124
What is the directional distribution of trips?
65% entering, 35% exiting 124 X 0.65 = 81 entering124 X 0.35 = 43 exiting
213
36177
124
8143
Using table 7.1, What is the percent demand from a retail to an office establishment? (PM Peak)
3%
3
What is the percent demand from an office to a retail establishment? (PM Peak)
23%
23
What is the percent demand from a retail to a residential establishment? (PM Peak)
53%
12What is the percent demand from a residential to a retail establishment? (PM Peak)
53%
53
What is the percent demand from an office to a residential establishment? (PM Peak)
2%
2
What is the percent demand from a residential to an office establishment? (PM Peak)
0%
0
Shopping Center
820200,000 f2
General Office
720120,000 f2
Low Rise Apt
221200 Units
989
475514
213
36177
124
81 43
3
23
12
53
2
0
Using table 7.2, What is the percent demand to a retail from an office establishment? (PM Peak)
2%
2
What is the percent demand to an office from a retail establishment? (PM Peak)
31%
31
What is the percent demand to a retail from a residential establishment? (PM Peak)
9%
9
What is the percent demand to a residential from a retail establishment? (PM Peak)
31%
31
What is the percent demand to a residential from an office establishment? (PM Peak)
2%
2
What is the percent demand to an office from a residential establishment? (PM Peak)
0%
0
Shopping Center
820200,000 f2
Low Rise Apt
221200 Units
989
475514
213
36177
124
8143
3
23
12
53
2
0
2
31
9
31
2
0
How many vehicles are exiting the shopping center to the office?3% X 514 = 15
15
How many vehicles are entering the Shopping center from the office?2% X 475 = 10
10
How many vehicles are entering the office from the shopping center?31% X 36 = 11
11
How many vehicles are exiting the office to shopping center?23% X 177 = 41
41
How many vehicles are exiting the shopping center to the apartments?12% X 514 = 62How many vehicles are entering the shopping center from the apartments?9% X 475 = 43How many vehicles are entering the apartments from the shopping center?31% X 81 = 25How many vehicles are exiting the apartments to the shopping center?53% X 43 = 23
62 43
25 23
How many vehicles are exiting the office to the apartments?
2% X 177 = 4
How many vehicles are entering the office from the apartments?
0% X 36 = 0
How many vehicles are entering the apartments from the office?2% X 81 = 2
How many vehicles are exiting the apartments to the shopping center?
53% X 43 = 23
4
0
2
0
General Office
720120,000 f2
Shopping Center
820200,000 f2
General Office
720120,000 f2
Low Rise Apt
221200 Units
989
475514
213
36177
124
8143
3
23
12
53
2
0
2
31
9
31
2
0
15 10
11 41
62 43
25 23
4
0
2
0
Balance the trips exiting the shopping center and entering the office with the least number of trips. (no more vehicles can enter than can exit.)
15 exiting vs. 11 entering balances to 11
11
Balance the trips entering the Shopping Center and exiting the office .
10 exiting vs. 41 entering balances to 10
10
Balance the trips entering the Shopping center and exiting the apartments.
46 exiting vs. 23 entering balances to 23
23
Balance the trips exiting the shopping center and entering the apartments.
62 exiting vs. 25 entering balances to 25
25
Balance the trips entering the office and exiting the apartments.
0 exiting vs. 0 entering balances to 0
Balance the trips exiting the office and entering the apartments.
4 exiting vs. 2 entering balances to 2
0
2
Shopping Center
820200,000 f2
General Office
720120,000 f2
Low Rise Apt
221200 Units
989
475514
213
36177
124
8143
3
12
12
53
2
0
2
31
9
31
2
0
15 10
11 41
62 43
25 23
4
0
2
0
11 10 2325
0
2
Add the balanced trips entering the shopping center
10 (from the office) + 23 (from the apartments) = 33
33
Add the balanced trips exiting the shopping center.
11 (to the office) + 25 (to the apartment) = 36
36
Total the internally captured trips.33 entering + 36 exiting = 69 trips
69
Subtract the internal trips from the total trips to calculate the external trips.
475 - 33 = 442514 - 36 = 478898 - 69 = 920
442478920
Calculate the percent internal and external capture by dividing the total from the sum of Internal / External trips.
69 / 989 = 7%920 / 989 = 93%
7% 93%
Repeat for the additional land uses.
111223
25165190
11% 89%
272350
542074
40% 60%
Shopping Center
820200,000 f2
General Office
720120,000 f2
Low Rise Apt
221200 Units
989
475514
213
36177
124
8143
3
12
12
53
2
0
2
31
9
31
2
0
15 10
11 41
62 43
25 23
4
0
2
0
11 10 2325
0
2
333669
442478920
7% 93%
Repeat for the additional land uses.
111223
25165190
11% 89%
272350
542074
40% 60%
Using the information calculated on the tables, enter in the remaining fields for trips Exiting/ Entering from External sources
478
442
165
25
54
20
442478920989
25165190213
542074
124
521663
11841326
The percent internal capture is calculated by the sum of the internally captured trips divided by the Total Single-Use Trips.
(69 + 23 + 50) / 1326 = 11%
11%
Now copy the values to the summary table on the bottom
Internal CapturePass By