Related Clues:

• Add a lane to
• Expand, as a highway
• Make wider
• Dilate
• Open up
• Improve, as a highway
• Modernize, as a highway
• Add more lanes to
• Expand laterally
• Enlarge, as a road
• Ream out
• Add lanes to, as a highway
• Broaden - enlarge
• Make broader, as a highway
• Grow broad