Related Clues:

• Spreads out
• Reams
• Adds a lane to
• Dilates
• Expands
• Increases in capacity
• Antonym of tapers
• Makes broader
• Expands horizontally
• Adds a lane
• Extends studies on central London area
• Broadens
• Expands, as a search
• Adds a lane to, say
• Gets dilated