Curvature value detection and evaluation

An apparatus comprising:

• a memory including a plurality of sets of vehicle trace data, wherein each set of vehicle trace data is separately collected by one or more vehicles while traversing a turning maneuver from a first road segment to a second road segment along a portion of a roadway;
• a map matching module configured to associate the plurality of sets of vehicle trace data with map data of the portion of the roadway;
• a splining module configured to generate respective splines for respective sets of vehicle trace data using a cubic spline fitting technique and identify respective segments of the respective splines containing a curve with a smallest radius of curvature;
• a curvature module configured to determine respective maximum curvature values for the identified respective segments of the respective splines and calculate an average curvature value of the respective maximum curvature values;
• and
• a controller configured to select an assisted or automated driving function based on the maximum curvature value.

A non-transitory computer readable medium including instructions that when executed are configured to perform:

• receiving position data collected by sensors of a vehicle while traversing a turning maneuver from a first road segment to a second road segment along a portion of a roadway;
• associating the received position data with map data of the portion of the roadway;
• generating a spline based on the position data, the spline being a smooth curve representing the turning maneuver;
• identifying a segment of the spline containing a curve with a smallest radius of curvature;
• determining a maximum curvature value for the identified segment of the spline;
• and
• selecting an assisted or automated driving function based on the maximum curvature value.