Which statement best describes a key design difference between a roundabout and a traffic circle?

Which statement best describes a key design difference between a roundabout and a traffic circle?

• A. Traffic circles have a larger center island.
• B. Roundabouts have a smaller center island, tighter curves, and lower speeds.
• C. There is no difference; they are the same.
• D. Roundabouts have a larger center island than traffic circles.

Answer: (B)

Roundabouts are designed to slow traffic through their geometry. A small central island with tight curves requires drivers to reduce speed as they approach, navigate the bend, and merge back into traffic, which improves safety for pedestrians and entering vehicles. Traffic circles, by contrast, tend to have a larger central island and gentler curves, allowing vehicles to travel at higher speeds around the circle. This is why the statement describing roundabouts as having a smaller center island, tighter curves, and lower speeds is the best description.

Roundabouts are designed to slow traffic through their geometry. A small central island with tight curves requires drivers to reduce speed as they approach, navigate the bend, and merge back into traffic, which improves safety for pedestrians and entering vehicles. Traffic circles, by contrast, tend to have a larger central island and gentler curves, allowing vehicles to travel at higher speeds around the circle. This is why the statement describing roundabouts as having a smaller center island, tighter curves, and lower speeds is the best description.