Angioedema-swelling of tissue beneath the surface of the skin-can be mistaken for or associated with hives. It can be caused by allergic reactions, medications or a hereditary deficiency of some enzymes. The following symptoms may indicate angioedema: 1  Swelling in the eyes or mouth. 2  Swelling of the hands, feet or throat. 3  Difficulty breathing, stomach cramps or chemosis (swelling of the lining of the eyes).
Turbo roundabout is a design developed by Bertus Fortuijn. Its design, when combined with appropriate signage, dramatically improves safety and traffic flow, and is surprisingly easy for the unfamiliar driver to navigate.
Rotaries, still in use in some parts of the country, are typically larger circles through which vehicles move at higher speeds, while neighborhood traffic circles are typically smaller than roundabouts, and used primarily to calm traffic. In a roundabout, there is no need to change lanes to exit, and traffic moves in a counterclockwise direction. A roundabout also has geometry that forces slower speeds and features islands at the approaches and yield signs. Here are instructions from the Federal Highway Administration on how to use a roundabout: