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INDIAN RIVER COUNTY <br /> PUBLIC; WORKS DEPARTMENT <br /> TRAFFIC ENGINEERING DIVISION <br /> TRAFFIC CONTROL DEVICES MAINTAINED BY INDIAN RIVER COUNTY <br /> July , 2012 <br /> VI . SPEED LIMIT ZONES ON COLLECTOR/ARTERIAL ROADWAYS ( continued ) <br /> ROADWAY FROM TO SPEED LIMIT( M . P . H . ) <br /> 20' x' Avenue 25"' Street SW 21 " Street SW 35 <br /> 20"' Avenue 21 " Street SW 17 "' Lane SW 35 <br /> 20"' Avenue 17 "' Street SW Oslo Road 30 <br /> 20"' Avenue Oslo Road I " Street SW 45 <br /> 20"' Avenue I " Street SW SR 60 35 <br /> Old Dixie Hwy South County Line 12 "' Street 40 <br /> Old Dixie Hwy 12 "' Street Seminole Avenue 35 <br /> Old Dixie Hwy Seminole Avenue 20"' Street 30 <br /> Old Dixie Hwy U . S . 1 49"' St 35 <br /> Old Dixie Hwy 49" ' St CR 510 45 <br /> I . R. Drive South U . S . 1 Sebastian Cty Lmt 30 <br /> I . R. Drive Sebastian City Lint North U . S . 1 30 <br /> 6"' Avenue U . S . 1 21 " Street 30 <br /> I . R . Boulevard U . S . 1 37t " Street 45 <br /> I . R. Boulevard 37 "' Street Grand Harbor Blvd 50 <br /> I . R. Boulevard Grand Harbor Blvd 53rd Street 45 <br /> NOTE : In accordance with Florida Department of Transportation speed zoning <br /> regulations , Florida Statutes Chapter 316 , and nationally adopted traffic <br /> engineering practices ( M . U . T. C . D . — Manual on Uniform Traffic Control Devices ), <br /> the speed limit on County roadways shall be set as close as possible to the 85 "' <br /> percentile speed ; that is , the speed which 85 percent of free-flowing vehicles are <br /> traveling at or below . In business and residential areas , the speed limit on paved <br /> roadways shall be posted at 30 miles per hour. All unpaved roadways shall remain <br /> unposted due to variable surface conditions . <br /> Page 15 of 18 <br />