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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