Summary
You can create horizontal labels for features of a polyline layer in ArcMap.
Procedure
- Right click on the polyline layer in the ArcMap Table of Contents and select Properties.
- Switch to the Labels tab.
- Click the 'Label Placement Options...' button.
- Check on the 'Centered on Line' check box.
- Select Horizontal from the Angle dropdown list.
- Click OK on the Placement Properties dialog.
- Check on the 'Label Features in this Layer' check box.
- Click Apply and OK on the Layer Properties dialog.