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- See also
This is a list of roads designated A21. Roads are sorted in the countries' alphabetical order. - A21 road (Australia), a road in South Australia
- A21 motorway (Austria), a road connecting Altlengbach and the A1 to Vösendorf and the A2
- A21 road (England), a road connecting London with Hastings on the south coast
- A21 motorway (France), a road connecting Aix-Noulette and Douai
- A 21 motorway (Germany), a road connecting the road interchange with the A 1 at Bargteheide with Wankendorf
- A21 motorway (Italy), a road connecting Turin and Brescia
- A-21 motorway (Spain), a road connecting Jaca, Aragon and Pamplona, Navarre
- A 21 road (Sri Lanka), a road connecting Kegalle and Karawanella
- A21 road (United States of America) may refer to:
- A21 road (California), a road
See also - List of highways numbered 21
- List of 21A roads
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