docs: @Pure
  	public Point2d getPosition2D() {
  		final Point1d p1d5 = getPosition1D();
  		if (p1d5 != null) {
  			final Point2d pos = new Point2d();
  			p1d5.getSegment().projectsOnPlane(
  					p1d5.getCurvilineCoordinate(),
  					p1d5.getLateralDistance(),
  					pos,
  					null);
  			return pos;
  		}
  		return null;
  	}