You can label lines, arcs, 2D polylines, feature lines, parcels, and alignments with AutoCAD Civil 3D label styles. The general line label styles are available for lines, arc, 2D polylines, feature lines, lot lines, and alignments. You can also convert these general line labels to tags.
When creating or editing line labels, you can select both parcel label/alignment label styles as well as general line and curve label styles. The commands to add single and multiple label types support each of the three object types (line/curve, parcel, and alignment).
To label lines, arcs, polylines, feature lines, parcel, and alignments with general line label styles
- Click Annotate tab
Labels & Tables panelAdd Labels menuLine and Curve Add Line and Curve Labels 
. - In the Add Labels dialog box, under Feature, select Line and Curve.
- Under Label Type, select Single Segment or Multiple Segment. Multiple Segment labels all segments on a selected polyline or feature line.
- Select the Line and Curve label styles to use. For more information, see Creating Label Styles for Lines, Curves, and Polylines.
Note that you can select parcel, alignment, and general line and curve label styles to annotate lines.
- If the label styles use Referenced Text , specify the Reference Text Object Prompt Method to use.
- Click Add. Then select the object to label.