This presentation is designed to provide information relating to the retroreflectivity requirements for TxDOT Item 666 – Retroreflectorized Pavement Markings. This presentation is focused on mobile retroreflectometer measurements. Material in the presentation will help answer the following questions: What do the specifications call for? What are the providers required to do? What do the required data look like? How should the data from the providers be used?
If you have any questions or comments please contact Adam Pike, [email protected]. Some common questions will be answered in the FAQ section.
Full Presentation (110-130 minutes)
You may download the full guidance presentation, or you may access its individual parts below. The listed times are an estimate of the time required to go through the presentation.
Part 1: Introduction (5 minutes)
- Objectives
- Background
- Specifications
Part 2: Pavement Marking Specifications Concerning Mobile Retroreflectivity (20-25 minutes)
- Item 666 – Retroreflectorized Pavement Markings
- SS 6291 – Mobile Retroreflectivity Data Collection for pavement Markings
Part 3: Mobile Retroreflectivity Programs (20-25 minutes)
- Mobile Retroreflectivity Certification
- Overview
- Requirements
- Certified Providers/Equipment
- Mobile Retroreflectivity Verification
- Overview
- Responsibilities
- TTI
- TxDOT
- Provider
- Results
- Maintaining Certification
Part 4: Pavement Marking Retroreflectivity Equipment (25-30 minutes)
- Portable Retroreflectometers
- Mobile Retroreflectometers
Part 5: Retroreflectivity Data Requirements and Analysis (35-40 minutes)
- Specification Requirements
- Data Analysis
- Data Interpretation
- Summary Spreadsheet Data
- Map File
- Video File
- Comparison to Requirements
- Common Issues
- Next Steps
- Data Interpretation
Part 6: Questions and Comments (<5 minutes)
- TTI Mobile Retroreflectivity Website
- FAQs
- Contact Information