Quote:
Originally Posted by billethkid
Add into the equation high volumes of high speed traffic, high percentage of people new/visiting the area, even higher percentage of senior and senior plus drivers and a formula for disater is in the making.
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Single-lane modern roundabouts (90-120 feet in diameter) can handle intersections that serve about 20,000 vehicles per day with peak-hour flows between 2,000 and 2,500 vehicles per hour. Two- and three-lane modern roundabouts (150-220 feet in diameter) can serve about 50,000 vehicles per day and handle 2,500 to 5,500 vehicles per hour. Right-turn slip lanes can increase that number if needed (just like for signal intersections). Much depends on how balanced the entries are, but only in determining how many lanes are needed for each movement.
Here’s a quote:
“By 2025, a quarter of all drivers in the United States will be over the age of 65. Intersections are the single most dangerous traffic environment for drivers of any age with left-hand turns being the single most dangerous traffic maneuver that any of us can make. Forty percent of all crashes that involve drivers over the age of 65 occur at intersections. This is nearly twice the rate of experienced younger drivers. AARP would like to see more roundabouts constructed because of the many safety benefits that they present for drivers of all ages.” - Jana Lynott, AARP Public Policy Institute