Curb extensions, also known as bulb-outs, are extensions of the sidewalk that protrude into the street at intersections. They reduce the width of the roadway, making it easier for pedestrians to cross by shortening the distance they need to walk. Curb extensions also improve visibility for both pedestrians and drivers, as they bring pedestrians closer to the street. These features can enhance safety by slowing down vehicle traffic and providing a designated space for pedestrians. Curb extensions are often used in urban areas to promote walkability and improve the overall experience of navigating streets, contributing to the goals of sustainable urban design and community planning.