| Road Photos & Information: South Australia | |||
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Statistics:
Route Numbering:

General Information:
A21 is designed to be a loop route or ring road around Adelaide and North Adelaide CBDs. It's a standard urban arterial road, with a small section, namely Park Road and Mann Road converted to one way sections.
The former National Route 1 section, is on the eastern side of the loop and takes in Robe Tce, Park Rd, Mann Rd, Hackney Rd, Dequetteville Tce and Fullerton Rd. This section was replaced in 1998 by A21, when Transport SA introduced alphanumeric numbering, causing a break in Highway 1 which circumnavigates Australia.
History:
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| Advance Directional Signs: Collection of AD signs on Greenhill Road (A21) in Adelaide, approaching the intersection with Fullarton Road. April 2007. Image © Darrin Smith |
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| Advance Directional Sign: Northbound AD sign on Fullarton Road in Eastwood, approaching Greenhill Road (A21). April 2007. Image © Darrin Smith |
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| White Advance Directional Sign: Southbound approaching the interchange for Majura Road (ALT-NR23) and Horse Park Drive, North Canberra. April 2007. Image © Darrin Smith |
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| White Advance Directional Sign: Westbound AD sign on Kensington Road, Norwood South, approaching the intersection with Fullarton Road (A21), Dequetteville Terrace (A21) and Wakefield Road, April 2007. Image © Darrin Smith |
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| White Advance Directional Sign: Southbound AD sign on Fullarton Road (non A21 section), Kent Town, approaching the intersection with Kensington Road, Dequetteville Terrace (A21), Fullarton Road (A21) and Wakefield Road, April 2007. Image © Darrin Smith |
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| AD Sign: Northbound at Kent Town alongside Rymill Park approaching Rundle Road and Rundle Street. April 2007. Image © Darrin Smith |
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| Rundle Road / Rundle Street Intersection: Northbound photograph from the corner of Rundle Road and Dequetteville Terrace, April 2007. Image © Darrin Smith |
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| Click here for the continuation of A21 | |
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