bulbouts

Bulbouts, also known as curb extensions, are protrusions of a street curb that extend the sidewalk area into the roadway. They are typically placed at street corners or mid-block crosswalks with the aim of shortening crossing distances for pedestrians, improving sightlines between drivers and pedestrians, and slowing turning vehicles. By enlarging the pedestrian space, bulbouts can enhance walkability and may accommodate street trees, planters, seating, or bike facilities.

Design and variations vary by context. Bulbouts are usually integrated into the curb line and can be full extensions or partial projections. They may include raised crosswalks or be combined with pedestrian refuges in wider streets. Accessibility is a key consideration, with ramps and level transitions designed to meet standards for curb ramps and accessible routes. Some bulbouts are permanent and constructed in concrete, while others are temporary or semi-permanent using paint, planters, or other removable elements. Drainage, utilities, and snow removal considerations influence placement and design.

Benefits and considerations. Benefits commonly cited include reduced pedestrian exposure to traffic, shorter and safer crossing for pedestrians, improved sightlines, and opportunities to add street furniture or greenery. Potential drawbacks include reduced roadway width for vehicles, conflicts with on-street parking or bus stops, and impacts on snow plowing, turning movements, or emergency vehicle access. Successful implementation requires appropriate right-of-way, careful alignment with curb ramps, and coordination with local traffic and transit operations.

Implementation context. Bulbouts are a common feature in urban design and traffic-calming strategies, particularly under Complete Streets initiatives. They are designed according to local standards and may be installed as part of streetscape projects, pedestrian safety programs, or temporary pilot programs to evaluate effectiveness before permanent construction.