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:
2. Choose which lane to enter based on which direction you want to exit. In multi-lane roundabouts, which usually have three or more possible exits, the lane you choose to drive in is dictated by the kind of turn you want to make: 1  Occupy the left lane if you decide to turn left, make a U-turn, or go straight.his will inform other drivers that you wish to exit the roundabout, easing confusion. 5. Yield only to pedestrians in the crosswalk or emergency vehicles when exiting a roundabout. Remember that drivers inside the roundabout have the right-of-way.