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The Wiley Dictionary of Civil Engineering and Construction p.160:
CURB-TO-CURB TURNING DIAMETER Smallest circle within which a vehicle will clear a curb I50 mm (5.9 in.) high while executing its sharpest practicable turn.
The Wiley Dictionary of Civil Engineering and Construction p.632:
WALL-TO-WALL TURNING DIAMETER Smallest circle that will enclose the outermost projecting points of a vehicle or machine while it is executing its sharpest practicable turn.