The California Department of Transportation (CALTRANS) has used Asphalt Rubber Chip Seals (ARCS) as an effective preventative maintenance strategy for over 20 years, not only on low volume roads, but also on major roadways where high truck traffic, high ambient and pavement temperatures have been prevalent. Due to flushing/bleeding in the wheel paths, on one particular project in Imperial County, California, six test sections were
placed to evaluate ARCS specification refinements. Key concepts developed are the minimum CRM content of twenty percent, use of PG 70–10 base stock asphalt, and recognition that two descending viscosity readings are necessary for proper asphalt rubber binder reaction. This paper will evaluate the effects of the ARCS specification refinements through the performance of six test sections, subjected to heavy traffic loads and high temperatures.