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State Road 21 (SR 21) runs mostly in a southwest-to-northeast direction in the US state of Florida from McMeekin to Jacksonville. It is also known as Blanding Boulevard for much of its length. SR 21 is one of three routes, along with Roosevelt Boulevard (US 17) and the First Coast Expressway (SR 23), that connect Jacksonville with its surroundings west of the St. Johns River. Congestion has become a problem over the years as local government works to develop infrastructure for the growing populations of Orange Park, Middleburg and Green Cove Springs with the northern connectivity sought and thought to be achieved by drastic road widening despite the decimation of Lake Shore's prewar scale. Residents of both Clay and St. Johns counties' communities rely on Duval's economy (Jacksonville) for employment. As a result, traffic is heavy during morning and evening rush hour, especially near and on I-295. Such has spurred the creation of the Collins Road / I-295 interchange. ==Route description== SR 21 begins at SR 20, and the western terminus of County Road 20A (CR 20A), in McMeekin in Putnam County. For the first , the road is a relatively flat two-lane rural highway heading north with occasional hills, with the only other notable intersection of importance being CR 21, a connecting spur to Marion County. North of here, the road begins to bear to the northwest, but curves to slightly back along the eastern shore of Lake Melrose. After intersecting SR 26 in Melrose, SR 21 enters Clay County briefly as it starts to move northwest and enters extreme southeastern Bradford County north of the intersection with Melrose Road, intersecting with CR 214 and CR 21B. Passing between Keystone Heights Golf and Country Club, and winding around Lake Geneva, SR 21 re-enters Clay County in Keystone Heights, acquiring the name Lakeside Avenue, and then Lawrence Boulevard. It intersects SR 100 where it makes a sharp turn to the northeast. North of Loch Lommond, SR 21 serves as the southeastern border of Camp Blanding. In this location, it also runs past Mike Roess Gold Head Branch State Park, and has a short concurrency with CR 315, after turning straight north in Belmore. West of Penney Farms, SR 21 intersects SR 16 and ceases to serve as the east side of Camp Blanding, but still remains a two-lane rural highway. Only when the road enters Middleburg does SR 21 become a four-lane divided highway just south of the intersection of CR 215 (Kingsley Lake Road), and curves to the northeast again. From here it gains the name Blanding Boulevard from here to its northern terminus. It then crosses CR 218. Shortly after then it serves as the terminus of CR 220 (Everett Avenue), and begins a hidden concurrency with SR 21, and serves as the southern terminus of CR 220A (Long Bay Road) before CR 220 ends the concurrency at Doctors Inlet Road. SR 21 then encounters Branan Field Road, which becomes SR 23 to the north. An interchange between SR 21 and SR 23 is planned to be built slightly to the west of the current intersection as part of the First Coast Expressway. The road crosses CR 220A again at Old Jennings Road. Beyond that, it has two western termini with another suffixed route, known as CR 21B (Jefferson Avenue) in Ridgewood. In Lakeside, SR 21 serves as the northern terminus of CR 224 (College Drive), providing access to Saint Johns River Community College. CR 21B ends at SR 21 again along Cleveland Avenue. Near Orange Park, the road curves straight north again where SR 224 serves as the last major intersection before entering Jacksonville, although SR 21 passes through one more community known as Meadowbrook Terrace, the home of the Orange Park Mall. North of the Clay–Duval county line, SR 21 enters Jacksonville, and then approaches the interchange with I-295, which was recently redesigned to accommodate ramps to Collins Road, a street that intersects with SR 21 north of the interchange. Within the rest of Jacksonville, the road intersects state highways such as SR 134 (103rd Street), and later serves as the eastern terminus of SR 208 (Wilson Boulevard), where SR 21 has a wide median as opposed to a center turn lane. Two blocks north of SR 208, Blanding Boulevard crosses over the Cedar River, a tributary of the Ortega River, and enters Lake Shore. Two blocks north of the bridge, the road intersects with the southern terminus of SR 111 (Cassat Avenue). SR 21 heads northeast for several blocks until its intersection with the east-west connector San Juan Avenue SR 128. Prior to SR 21's northern terminus, Blanding continues to the northeast for several more blocks north of San Juan Avenue until it straightens to the north again and crosses St. Johns Avenue. Blanding Boulevard has a full intersection with Park Street, with eastbound Park Street providing access to US 17 south. North of Park Street, Blanding becomes a limited access connecting overpass crossing over Hamilton Street, a double tracked railroad, and has an interchange with US 17 (Roosevelt Boulevard) northbound at the edge of Florida State College at Jacksonville's Kent Campus, also with access from US 17 Roosevelt Boulevard southbound to SR 21 southbound. SR 21 ends at a second intersection with Park Street and an entrance to Kent campus at the eastern end of the interchange. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Florida State Road 21」の詳細全文を読む スポンサード リンク
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