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Section 10: Long-Term Pavement Performance Data

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Overview

The long-term pavement performance data program is a federal aid research program that began as part of the Strategic Highway Research Program (SHRP) (accessible from a link on the TxDOT Internet at http://www.dot.state.tx.us/insdtdot/orgchart/tpp/links.htm). The program was initiated in 1987 and is set to run through 2007.

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Long-Term Pavement Performance Data Collection

TPP collects LTPP data at 71 sites (see Table 1-6) throughout the state. There are also 7 sites (see Table 1-7) at which data are continuously collected. AVC counts are made continuously during the year with the exception of a one-week period at each site during which weigh-in-motion data are collected. The AVC data are collected in the Texas vehicle classification scheme (see Table 1-3), while the WIM data are collected with FHWA vehicle classification (see Table 1-8) scheme.

TPP uses the data for developing predictive equations for pavement design, pavement management, and sensitivity analysis that determine the effects of loading, material properties, environment, and specific design features on performance of the pavement.

Anchor: #BGBJFCDGTable 1-6: Long-Term Pavement Program Site Locations by District

Click on district name to access location listing

Abilene District

Dallas District

Paris District

Amarillo District

El Paso District

Pharr District

Atlanta District

Fort Worth District

San Angelo District

Austin District

Houston District

San Antonio District

Beaumont District

Laredo District

Tyler District

Brownwood District

Lubbock District

Waco District

Bryan District

Lufkin District

Wichita Falls District

Childress District

Odessa District

Yoakum District

Corpus Christi District

 

 


Anchor: #BGBCBDJJTable 1-7. LTPP Sites with Continuous WIM

District

LTPP ID No.

Highway

No. of Lanes

Direction

County

City

Austin

0001

LP 1

1

NB

Travis

Austin

San Antonio

0900

LP 1604

1

SB

Bexar

San Antonio

Bryan

0800

FM2238

2

EB

Brazos

Bryan

Dallas

1069

US 175

1

EB

Kaufman

Crandall

Pharr (lw-522)

0100

US 281

4

SB

Hidalgo

Falfurrias

Childress

5334

IH 40

4

EB

Wheeler

Shamrock

Amarillo

5336

IH 27

4

SB

Randall

Canyon


Anchor: #BGBCEECJTable 1-8: FHWA Vehicle Classification Scheme

Classification Number

Vehicle Type

Link to Figure

1

Motorcycles

Figure 1-14

2

Passenger cars (with 1- or 2-axle trailers)

Figure 1-15

3

2 axles, 4-tire single-unit pickup or van (with 1- or 2-axle trailers)

Figure 1-16

4

Buses

Figure 1-17

5

2D - 2 axles, 6-tire single unit (includes handicapped bus and mini school buses)

Figure 1-18

6

3 axles, single unit

Figure 1-19

7

4 or more axles, single unit

Figure 1-20

8

3 to 4 axles, single trailer

Figure 1-21

9

5 axles, single trailer

Figure 1-22

10

6 or more axles, single trailer

Figure 1-23

11

5 or less axles, multi-trailers

Figure 1-24

12

6 axles, multi-trailers

Figure 1-25

13

7 or more axles, multi-trailers

Figure 1-26



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Long-Term Pavement Performance Data Analysis

TPP retrieves data via telemetry nightly and submits them to the LTPP coordinator for analysis, using a C file for classification data and a W file for the WIM data.

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Long-Term Pavement Performance Data Reporting

TPP reports LTPP data using the FHWA classification scheme in the format prescribed by the State Highway Research Program (SHRP). Data are reported monthly to the SHRP regional coordinator, who compiles data from several states and submits the compiled data to FHWA.

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