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Section 4: Single Source Traffic Data Operating Procedures

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Summary

Policy — The department will maintain a single source of all traffic data reported to the commission, legislature, governor, and the public.

Transportation Planning Division Contact — The districts and divisions may call the Traffic Analysis Section of TPP concerning traffic data requests.

Types of Traffic Data — The following chart shows both traffic data for possible review and the Traffic Analysis Section’s current projects which may entail later review.

  • Part A of the chart shows the different types of traffic data, whether data are furnished by TPP, whether they require review by TPP, and if the data may be distributed outside the department.
  • Part B of the chart shows traffic data furnished by TPP to the department that are subject to standard workload restraints and may entail a longer response period than data only under review. This is due to the level of detail required and the initial assessment. If this traffic data is needed later for use outside the department it will require a subsequent review.
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Furnished by TPP

Requires TPP Review

May Be Used Outside TxDOT

Part A – Type of Traffic Data

1.

  • State, district, urban, and county traffic maps
  • Note: Be careful to differentiate between weekday unadjusted volumes and those volumes adjusted to annual average daily traffic.

  • Annual Report of Vehicle Classification
  • Annual ATR Report (permanent automatic traffic recorders)
  • Vehicle miles of travel and mileage from Texas Travel (TT) tables
  • Published route and feasibility studies

Yes

No

Yes

2.

  • Unadjusted 24-hour traffic counts
  • Urban area forecast modeled traffic volumes
  • Traffic signalization volumes

Yes

No

No

3.

  • Current traffic estimates derived from previously furnished data such as traffic counts
  • Projected traffic from traffic log
  • Urban area final forecast year model assignments
  • Previously furnished traffic data from corridor analysis projects

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Part B – Current Projects

4.

  • Geometric design volumes
  • Pavement analysis
  • Environmental impact air/noise studies
  • Program calls (i.e., UTP)

Yes

Yes

Yes, with subsequent review by TPP



Traffic Data Requiring Review by TPP — The following procedure outlines the process for traffic data that require review by TPP:

  • District/Division Personnel – Forward traffic data requiring review by TPP through the appointed district/division staff liaison to TPP with the following information attached:
    • if the traffic data are needed urgently and require an immediate response
    • how the traffic data will be used (i.e. community speech, road design, etc.)
    • project location map of immediate area (part of a district traffic map may be sufficient)
  • District/Division Staff Liaison -- Reviews the traffic data request for completeness and forwards to TPP
  • Transportation Planning and Programming Division – Upon receipt of the traffic data:
    • stamps the date received
    • reviews, analyzes, and prioritizes the data
    • acknowledges receipt of the data notifying the originating office of approval to use the traffic data as submitted or that TPP must review and analyze the traffic data further Note: TPP notifies the originating office of approval or further review within two weeks of the date of receipt unless the review is marked urgent requiring TPP to respond immediately.
    • performs further analysis of traffic data to be used outside the department. This normally requires four weeks but sometimes requires an extended review.
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Purpose

The purpose of this policy is:

  • to provide operating procedures for the districts and divisions to implement Executive Order 6-90, which established the TPP as the sole source of traffic data from the department
  • to inform the districts and divisions of which traffic data provided by TPP are for use outside the department and what portion of that traffic data requires review by TPP.
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Responsibility

Transportation Planning and Programming Division and districts and divisions

The Transportation Planning and Programming Division will:

  • review, modify, and approve all traffic data used in any documents including reports sent to the commission, the legislature, the governor, and the public within a reasonable time of receipt
  • coordinate with the districts and divisions to ensure consistent traffic data.

The districts and divisions will:

  • appoint a staff person to be liaison with TPP for traffic data review and approval
  • submit external documents that include traffic data developed in the district or divisions to TPP for review and approval. Note: This submission should include a project location map of the immediate area.
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Reference

Current Policy: Administrative Circular 17-90

Supersedes:

Reference: Executive Order 6-90

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