This standard specifies the method for measuring the minimum turning diameter of automobiles. This standard applies to all types of vehicles with front-wheel steering.
GB/T 12540-1990 history
2009GB/T 12540-2009 Minimum turning circle diameter,minimum turning clearance circle diameter and out value test method for motor vehicles
1990GB/T 12540-1990 Motor vehicles--Minimum turning diameter--Method of measurment