3M Linear Delineation Panels: Helping Reduce Accidents on Louisville Interchanges

With its sharp curves and intersecting on and off ramps, the interchange where I-64, I-65, and I-71 converge in downtown Louisville has always been known as “Spaghetti Junction.” Portions of this interchange have experienced a high rate of traffic incidents in the past, particularly large truck rollovers and car spinouts. Local officials were seeing numerous rollovers annually, which impacted road safety and caused expensive ramp closures and delays to motorists. In 2018, the District’s Traffic section started exploring ways to improve the situation.

The KYTC District 5 Engineering Team, started by studying the ramp to understand traffic volume and how people were navigating the curve. This led to a list of possible improvements, including changes to roadway striping and infrastructure to improve visibility in all different weather conditions.

Analysis of the collected data showed that it was imperative to make the curve itself more defined. To improve safety and provide better visibility, KYTC installed 3M™ Diamond Grade™ Linear Delineation System (LDS) panels throughout the curve. These LDS panels are engineered with a special corrugated pattern laminated with retroreflective sheeting. This reflects more light at different angles—making them perfect for applications where they needed to guide drivers through challenging curves. The panels were a low-cost safety improvement and met their safety goals and budget.

The KYTC District 5 team recently completed another similar project on a problematic curve on the I-64 West ramp to I-65 North. Here, 650 lineal feet of fluorescent yellow LDS panels were installed on the curve’s barrier wall – installation time was only three hours, utilizing two teams of three people each.

Since completion, serious traffic incidents have decreased substantially on these once problematic ramps. Local first responders and even the FHWA took notice of the drastic reduction in rollover accidents in the area and have reached out to the team acknowledging this safety improvement.

The success of lower-cost safety improvement strategies such as adding All-Weather Pavement Markings and Linear Delineation System panels to high incident areas has led the KYTC to consider future implementation where crash histories show the need for additional safety measures.

Set your sights on safety by learning more about lower-cost safety improvements to help guide your motorists through challenging roadways.