The study included the results of a pilot in which the department used thermoplastic lane markings, which according to NCDOT are more durable and better at reflecting headlights thanks to embedded glass beads in the plastic paint. The newer material was applied to 400 miles of rural, two-lane roads across the state between 2014-2017.
The department found a 13% reduction in lane-departure crashes, such as vehicles veering off the roadway, after the long-life markings were added to the roadway. The higher-quality lane markings help drivers better navigate the roads and curves, particularly at night or in the rain. In some cases, the department also applied 6-in.-wide lane markings, instead of the standard 4 in., to improve visibility.
According to NCDOT, more than half of crashes in North Carolina that kill or seriously injure people involve vehicles departing their lanes. The department focused the pilot on rural, two-lane roads because they disproportionately represent a large share of such crashes. One of the main reasons is that North Carolina has one of the nation’s highest number of vehicle miles traveled over rural, two-lane roads.
State Traffic Engineer Kevin Lacy said long-life pavement markings are 40% more expensive than traditional roadway paint, but they are more visible at night and in the rain, and they last between five years and seven years, compared with the average two-year cycle of regular paint.
“This is a proactive and systemic approach to enhancing safety that yielded a demonstrable crash reduction,” Lacy said in a statement. The department has spent $64 million on thermoplastic markings over secondary roads between 2015 and 2019. Lacy said the department will continue to invest in long-life lane markings.
SOURCE: North Carolina DOT