Heat transfer efficiency/capability. better. less. Ethylene glycol has superior heat transfer efficiency due to lower viscosity - but more fluid must be circulated to transfer the same amount of energy since Propylene glycol has higher specific heat. Viscosity.
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:
On approach you must be in the left lane unless otherwise marked on the road, and indicate a left turn. You must give way to traffic already on the roundabout if there is any risk of a collision. Enter the roundabout when there is a safe gap in the traffic.Stay in the left lane.ndicating When approaching a roundabout, if you are turning left or right, you must indicate left or right. When exiting a roundabout, whether you are turning left, right or even going straight ahead, you must always indicate a left turn just before you exit, unless it is not practical to do so.