Temporary Traffic Control Devices (TTCD)

Roadside delineators are widely used to supplant pavement markings. They are a form of “traffic control device” as defined by the MUTCD. Typically, roadside delineators are used on curvilinear sections of roadway, thereby enhancing the horizontal geometry so motorized vehicles may negotiate the curve. They are especially important roadway safety features during nighttime, or adverse weather, driving.

Roadside delineators may be flexible (plastics) or rigid (steel or aluminum). AASHTO/NTPEP only tests flexible roadside delineators. These may be either surface-mount or ground-mount style delineators. AASHTO/NTPEP conducts field performance testing, where a standard sedan impacts a test deck of delineators during summer and winter climate; the half-year test constitutes a “test cycle.” Also, laboratory testing is conducted on the sampled delineator specimens.

The national testing facility under AASHTO/NTPEP auspices is operated by Tennessee DOT. This is the same site used prior to NTPEP’s inception under the SASHTO Regional Testing Facility.

Besides flexible delineators, NTPEP conducts field performance tests on workzone drums/barrels, which are commonly used in construction and maintenance workzones to delineate and “separate” the travel way from the workzone. Typical application of workzone drums is in a taper approaching when workzone. AASHTO/NTPEP initiates testing on workzone drums only in the winter/summer test cycle (not summer/winter cycle); industry recommended this cycle because it represented a more severe endurance test.

The NTPEP Technical Committee responsible for authoring the Project Work Plan convenes yearly at the NTPEP National (Annual) Meeting. During this working meeting, the Project Work Plan is discussed, changes made, and shortly thereafter balloted for adoption. Improvements are immediately implemented in the next available testing cycle. When compared to other standards development exercises, the NTPEP process is agile, effective, and efficient.

NTPEP Designated Labs:

Delineators:

  • Future Labs (Laboratory Testing)
  • Texas A&M Transportation Institute (Impact Testing)

Work Zone Drums:

  • Tennessee Department of Transportation (Laboratory and Impact Testing)

NTPEP - Temporary Traffic Control Devices


Committee Name:
NTPEP-Technical Committee on Temporary Traffic Control Devices
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Work Plan
NTPEP tests products according to a Project Work Plan, which describes the laboratory and/or field test protocols used to conduct the evaluation. The Project Work Plan is a consensus-based document, and includes peer review and input from industry experts. Each Project Work Plan is adopted after receiving at least two-thirds affirmative support from 52 AASHTO member states. The Project Work Plan is the basis for host states to conduct their testing and evaluation. When implemented by state DOTs, their own state standard specifications may supersede the NTPEP Project Work Plan. Industry is advised to be aware of state-level requirements, which may supersede basic NTPEP testing.

Work Plan for Evaluation of Temporary Traffic Control Devices Flexible Delineators​​

Work Plan for Evaluation of Temporary Traffic Control Devices: Plastic Work Zon​e Drums​

User Guide
Temporary Traffic Control Devices User Guide​

QC/QA Guides
QC Plan TTCD Delineators and Drums
TTCD TDOT Requirements

Please go to NTPEP DataMine.

Please go to NTPEP DataMine.

Temporary Traffic Control Devices (TTCD)

Overview

  • Product types evaluated are flexible delineator posts (ground mount and surface mount) and plastic work zone
  • Manufacturers of TTCD products shall certify that the product meets all requirements as described in the “Manual of Uniform Traffic Control Devices” (MUTCD).
  • Flexible delineator post evaluations consist of both laboratory testing and comprehensive impact
  • Plastic drum evaluations consist of a field trial

 

Lab Evaluation

  • Flexible delineator posts are evaluated for ASH Test (D5630), Density and Specific Gravity (D792), Yellowness Index (E313) and Daytime Luminance (E1347)
  • Lab testing is performed under NTPEP contract by Future Labs LLC, Madison

 

Field Evaluation

  • TTCD products are subjected to an impact test. The impact vehicle used is a small sedan meeting the requirements of a MASH -16 1100C
  • The impact velocity for flexible delineator posts is dependent on the intended use of the product as follows:
    • Low Durability Side of Roadway Applications (55 mph) – Maximum of 10
    • High Durability Metropolitan Delineator Applications (55 mph) – up to 200 impacts
    • High Speed High Durability Applications (70 mph) – up to 200 impacts
  • The impact velocity for plastic drums is 55 +/- 2
  • Delineator Impact tests are performed in warm weather, (≥ 81 degrees), and again in cold weather, (≤ 34 degrees).

After specified numbers of impacts (Run 1, 10, 50, 100, 150 and 200) the following observations will be documented:

  • The product is inspected to detect any splits, cracks, breaks or other forms of
  • The approximate percentage of the reflective area that is damaged is
  • The percent list/lean from vertical is measured for The following additional observations will be documented:
  • Observed installation issues including the performance of bonding agents used to adhere the delineator to the roadway
  • Observed issues related to special equipment or techniques required to installation or removal of
  • Observed problems associated with restacking drums after 10

 

Links

Additional information about this evaluation can be found at: http://www.ntpep.org/Pages/TTCD.aspx

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

AASHTO NTPEP DataMine https://data.ntpep.org

 

Sample Specifications

  • South Carolina Qualified Product Policy for Flexible delineator posts
  • South Carolina specification for flexible delineators
  • Florida Specification for Flexible Delineators
  • Louisiana flexible post approval procedure
  • Michigan qualification procedure for flexible delineators
  • Missouri specification for drum-like channelizers
  • Pennsylvania spec for drums
  • Tennessee Qualification Procedure for Workzone Traffic Drums