Keeping it moving: City still working to improve congested intersections



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Sicard Hollow Rd. /Blue Lake Rd. Intersection

The most dangerous aspects of this intersection is attempting a left turn from Sicard Hollow to Blue Lake Dr., or attempting attempting to turn left from Cahaba Heights Rd on to Sicard Hollow R. The visibility of oncoming traffic is very limited, and during peak traffic times turning left becomes very dangerous. That intersection has limited physical space needed to expand visibility, and a roundabout might not resolve the lack of visibility . A traffic light with supplemental approach lights might be safer for all drivers.

Vina Morros 182 days ago

The road?

"whether the road can handle a roundabout"? I'm sure the road will get over it.

Single-lane modern roundabouts (50-120 feet in diameter) can handle intersections that serve up to 20,000 vehicles per day with peak-hour flows between 2,000 and 2,500 vehicles per hour.

Mini-roundabouts are less common in North America, but frequently used in the UK. Their footprint is smaller, making them suitable for retrofit situations with right of way constraints (and lower cost). They are also commonly used where truck U-turns are not needed, so achieve all the safety benefits of compact modern roundabouts at a much lower cost. They are all truck apron, and in the UK are sometimes just paint on the road.

Mini-roundabouts examples:
SR 432, Kelso, WA (5 days to build):
San Buenaventura, CA:
Jefferson, GA: SR 124 and SR 11:
Turin, GA:
Coralville, IA:
Hoover Elementary, Cedar Rapids, IA:
Gurnee, IL, Almond Rd and Dada Dr:
Bel Air, MD, Tollgate & MacPhail (11,000 vpd see 1:53):
Dimondale, MI:
Ypsilanti, MI, Textile-Stony Creek:
Ypsilanti, MI, Moon at Bemis:
Shakopee, MN, Vierling and CH 79:
NW 12th and N Jefferson, Ava, MO:
Lake Ozark, MO:
Union City, MO:
Missoula, MT: Toole and Scott:
Maple and Horner, Elmira, NY:
Maple and Caldwell, Elmira, NY:
Chattanooga, TN, 4th Ave and 37th St:
Shawnee, OK:
SW 47th Dr at 43rd Ave, Portland, OR (test):
Dory Point Loop and Centerpointe Dr, Pacific City, OR:
Vienna, VA, Park and Locust St:
Spring and Argyle, Friday Harbor, WA:
164th Ave NE and NE 76th St, Redmond, WA (15,000 vpd):
Grandview Rd and Kickerville Rd, Whatcom County, WA (Construction):
White Center, WA:
St. James, MN:
Eastvale, CA:

Stanley Bridge, PE:
Charlottetown, PEI:
Sundre, AB (3 in a row, temporary installs):

Scott Batson 193 days ago

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