Effects of a rumble strip barrier line on lane keeping in a curve

No vehicle with oncoming traffic crossed the barrier line after rumble strip. Encroachments of passenger cars in free-flow traffic with no oncoming traffic fell from 9.2% to 2.5% after re-painting, with no further change after implementing the rumble strip. The improvement in visual guidance alone reduced the number of crossings. However, including rumble strips may reduce the need for frequent re-painting of barriers.