Guidance for Conducting Wet Retroreflectivity Measurement of Pavement Markings
This presentation is designed to provide information relating to the measurement of pavement markings in continuous wet conditions. The guidance for conducting wet retroreflectivity measurement of pavement markings covers the objective of the presentation, related standards and specifications, the equipment that will be needed to conduct the measurements, the measurement process, data analysis, best practices to consider when planning and conducting wet retroreflectivity measurements, and where to go for additional information.
Wet Retroreflectivity Measurement Field Guide
The field guide can be used as a simple document to reference while in the field taking measurements. The field guide contains:
- Bulleted lists of information to serve as reference points during the measurement process.
- Key best practices to help guide proper measurement and address possible issues that may arise.
- Images of the measurement process that can be referenced to ensure proper setup.
Wet Retroreflectivity Measurement Guidance Video
The guidance video covers two critical areas of the continuous wet retroreflectivity measurements: the calibration process and the measurement process. The video shows the proper way to setup and calibrate portable retroreflectometers, and the proper way to setup and calibrate the continuous wetting spray device. The video shows how to position the retroreflectometer and the spray device, how to check that the system is functioning properly, how to check that the retroreflectometer is flat, and how to take dry and continuous wet retroreflectivity readings. The video is only a few minutes long but provides valuable information for someone who may not be familiar with the calibration and measurement process.
Continuous Wetting Device Calibration Spreadsheet
This spreadsheet tool is designed to assist with properly calibrating the continuous wetting device for continuous wet retroreflectivity measurements. The user must enter their water capture container size, duration of the calibration trail, and quantity of water captured. The spreadsheet then automatically calculates the wetting rate, uniformity of the spray, and determines if the system is within the required ASTM E2832 wetting parameters.