Why should you give plenty of room to large vehicles in roundabouts?

• Because they have to swing wide within the roundabout.
  Explanation:

  "Trucks and buses may need to swing wide on the approach or within the roundabout to navigate the turn safely. Give them plenty of room to avoid collisions or close calls."
• Because they are fast-moving vehicles.
• Because they cause less turbulence.
• Because they have small blind spots.