• ♦Manual Notice2001-1
• ▼1. Traffic Estimation and Forecasting
  • ♦1. Overview
  • ►2. Traffic Data Collection and Reporting
    • ♦Overview
  • ►3. Automatic Traffic Recorder Volume Data
    • ♦ATR Data Collection
    • ♦ATR Data Analysis
    • ♦ATR Data Reporting
  • ►4. Accumulative Count Recorder Traffic Data
    • ♦ACR Data Collection
    • ♦ACR Data Analysis
    • ♦ACR Data Reporting
  • ►5. Highway Performance Monitoring System Traffic Data
    • ♦Overview
    • ♦HPMS Data Collection
    • ♦HPMS Data Analysis
    • ♦HPMS Data Reporting
  • ►6. Five Year Count Program
    • ♦Overview
    • ♦Five Year Count Data Collection
    • ♦Five Year Count Data Analysis
    • ♦Five Year Count Data Reporting
  • ►7. Vehicle Classification Data
    • ♦Vehicle Classification Data Collection
    • ♦Vehicle Classification Data Analysis
    • ♦Vehicle Classification Data Reporting
  • ▼8. Truck Weigh-in-Motion Data
    • ♦Weigh-in-Motion Data Collection
    • ♦Weigh-in-Motion Data Analysis
    • ♦Weigh-in-Motion Data Reporting
  • ►9. Vehicle Speed Data
    • ♦Vehicle Speed Data Collection
    • ♦Vehicle Speed Data Analysis
    • ♦Vehicle Speed Data Reporting
  • ►10. Long-Term Pavement Performance Data
    • ♦Overview
    • ♦Long-Term Pavement Performance Data Collection
    • ♦Long-Term Pavement Performance Data Analysis
    • ♦Long-Term Pavement Performance Data Reporting
  • ►11. Border Trend Traffic Data
    • ♦Overview
    • ♦Border Trend Traffic Data Collection
    • ♦Border Trend Traffic Data Reporting
  • ♦12. Traffic Data for Special Projects
  • ►13. Off-System Traffic Data
    • ♦Off-System Traffic Data Collection
    • ♦Off-System Traffic Data Analysis
    • ♦Off-System Traffic Data Reporting
  • ►14. Permanent ATR Locations by District
    • ♦ATR Locations
  • ►15. Vehicle Classification Count Locations
    • ♦Count Locations
  • ►16. Speed Data Collection Sites
    • ♦Speed Collection Sites
  • ►17. Long-Term Pavement Program Site Locations
    • ♦Pavement Program Sites
  • ►18. Texas 6 Vehicle Classification Figures
    • ♦Texas 6 Vehicle Classifications
  • ►19. FHWA Vehicle Classification Figures
    • ♦FHWA Vehicle Classifications
• ►2. Urban Travel Demand Forecasting
  • ►1. Overview
    • ♦Forecasts Guide Planning
  • ►2. Texas Travel Demand Model Package
    • ♦Overview
    • ♦Trip Generation
    • ♦Trip Distribution
    • ♦High Occupancy Vehicle (HOV)
    • ♦Traffic Assignment
  • ►3. Travel Demand Modeling Process
    • ♦Overview
    • ♦Traffic Analysis Zones, Districts, and Sectors
    • ♦Network Development
    • ♦Trip Generation Data Development
    • ♦Trip Distribution Data Development
    • ♦Model Calibration
    • ♦Model Validation
  • ►4. Travel Demand Model Output
    • ♦Overview
  • ►5. Air Quality Conformity Modeling
    • ♦Overview
    • ♦Air Quality Conformity Modeling Process and Programs
  • ►6. Travel Demand Forecasting Organization
    • ♦Responsible Organizations
  • ►7. Travel Demand Modeling Procedures
    • ♦Review and Update
• ►3. Project Level Traffic Data Development
  • ►1. Feasibility Studies
    • ♦Overview
    • ♦Traffic Data Provided
  • ►2. Advanced Planning
    • ♦Overview
    • ♦Traffic Data Provided
  • ►3. Environmental Documentation
    • ♦Overview
    • ♦Traffic Data Provided
  • ►4. Project Design
    • ♦Overview
    • ♦Geometric Design
    • ♦Traffic Data Provided
  • ►5. Pavement Design
    • ♦Overview
    • ♦Traffic Data Provided
  • ►6. Bridge Design
    • ♦Overview
    • ♦Traffic Data Provided
  • ►7. Signalized Intersection Design
    • ♦Overview
    • ♦Traffic Data Provided
  • ►8. Traffic Data for Special Projects
    • ♦Transportation Commission Requests
    • ♦Project Calls
    • ♦Major Investment Studies
    • ♦Traffic Data Provided
  • ►9. Traffic Data and Forecast Request Procedures
    • ♦Requested Information
• ►4. Database Management
  • ►1. Overview
    • ♦Functional Responsibilities
  • ►2. Data File Creation/Maintenance
    • ♦Texas Reference Marker
    • ♦State Railroad File
    • ♦RI File
    • ♦Accident File
    • ♦Highway Performance Monitoring System
    • ♦HPMS Mileage Certification
    • ♦Linear Reference System
  • ►3. Mapping
    • ♦State Base Map Updates - Data Collection

Anchor: #BGBHCGIB

Section 8: Truck Weigh-in-Motion Data

Anchor: #i1105117

Weigh-in-Motion Data Collection

Weigh-in-motion (WIM) equipment determines vehicle weights while vehicles are moving. The equipment collects traffic volumes by vehicle classification and weight. The data also include date, time, vehicle length by axle spacing, speed, and axle weight. There are two types of WIM systems used: bending plate and piezo.

TPP uses bending plate WIM equipment to collect data at up to 15 sites (see Table 1-4), which are surveyed 48 hours during each quarter of the year Data are polled from all working sites 365 days annually for future reference. The number of WIM locations for which data are available varies each year due to construction, road conditions, and road WIM hardware. Mobile WIM equipment in the form of surface-mounted sensors is being tested and may be available in the future.

Anchor: #i1163181Table 1-4. Weigh-in-Motion Locations

Site Number	District	County	Hwy	Location
LW-519	Abilene	Mitchell	IH20	2.1 mi. W of FM 2836
LW-504	Abilene	Nolan	IH20	0.7 mi. E of US 84
LW-520	Amarillo	Randall	IH27	0.5 mi. S of SH 217
LW-507	Bryan	Walker	IH45	2.6 mi. S of PR 40
LW-512	Corpus Christi	Live Oak	IH37	0.7 mi. S of FM 2049
LW-514	Dallas	Kaufman	IH20	0.7 mi. W of SH 429
LW-510	El Paso	El Paso	IH10	2.4 mi. W of LP 375
LW-521	El Paso	El Paso	US 54	At Delta just N of Customs
LW-509	Paris	Hunt	IH30	2.5 mi. W of SH 50
LW-517	Pharr	Hidalgo	US83	0.2 mi. W of FM 1426
LW-522	Pharr	Hidalgo	US281	9.3 mi. N of SH 186
LW-502	San Antonio	Guadalupe	IH10	0.4 mi. E of FM 775
LW-516	San Antonio	Bexar	IH35	5.3 mi. S of LP 1604
LW-518	San Antonio	Kerr	IH10	5.7 mi E of US 290
LW-513	Waco	Bell	IH 35	0.9 mi. N of Williamson Co. line
LW-506	Wichita Falls	Wichita	US 287	1.5 mi. W of LP 11

The FHWA long-term pavement program (LTPP) (see Table 1-5) sites and locations where site-specific WIM are justified for pavement design use piezo systems. Site-specific WIM data collection for pavement design is justified by TPP at locations where:

• roadway sections exist with large volumes of trucks that leave plants full and return empty
• pavements are deteriorating much faster than expected
• pavements are deteriorating in one direction much faster than the other.

Anchor: #BGBBJHEETable 1-5: Speed Data Collection Sites 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: #i1105174

Weigh-in-Motion Data Analysis

TPP collects WIM data via telemetry, processes the data into Card2, Card4, and Card7 formats as detailed in the Traffic Monitoring Guide, and submits them to analysis staff and Long-Term Pavement Program (LTPP) coordinator.

Using the RD68 program, TPP calculates ESALs for pavement design from the collected WIM data.

Anchor: #i1105191

Weigh-in-Motion Data Reporting

TPP reports WIM data using the Vehicle Tracking Recording Information System (VTRIS) developed by FHWA.