Highway Research Record

V. TRAFFIC AND TRANSPORTATION
2. SAFETY AND ENVIRONMENT
COMPLETED PROJECTS
Development of Luminous Paints for Road Markings

Duration:February 1989 to March 2005
Central Electro-Chemical Research Institute, Karaikudi

Present Status and Progress

The project has been Completed.

Findings/ Conclusions
The commonly available paints in the country do not last long specially on heavy traffic routes and are non-reflective. Clear visibility of road markings both during day and dark hours is one of the most important factor for road safety. CECRI has reported six chemical formulations three for white paint and three for yellow paints after trying various options out of the available ingredients. The developed six formulations were evaluated for durability and photometric performance by Central Road Research Institute, New Delhi and National Physical Laboratory New Delhi respectively in the year1996. Transverse test lines across the carriageway of 10 cm width and 15 cm gaps of uniform thickness were laid perpendicular to the lines at five locations in Delhi viz. Mathura Road in front of CRRI, inside the campus of NPL, Dr. Krishnan Marg opposite NPL, Maharani Bagh opposite CRRI staff quarters and on Ring Road opposite Siddartha extension.

The comparative durability performance was carried out by CRRI. The study showed that two formulations have useful life more than 14 months. The first formulation was of white paint having chlorinated rubber, Alkyd resin, Titanium dioxide and coconut oil. The second formulation for yellow paint has chlorinated rubber Alkyd resin and chrome yellow.

In addition to this the developed formulations were tested by NPL for photometric performance and optimization of the content of glass beads in the paint. The study was very limited as coefficient of retro-reflection was measured upto 54 days and it does not lead to any conclusion about the optical performance of developed formulation in terms of retro-reflection.

Recommendations

Further R&D work on the above subject should be pursued for the evaluation of minimum and maximum values of durability/reflectivity and other physical properties as laid down in ASTM and BS Standards.

Reports/ Publications
Final report on the study has been submitted.