Answer:

widened

Answer	Crossword Clue
WIDENED	Improved, as a highway
WIDENED	Increased in breadth
WIDENED	Let out

WIDENED	Broadened
WIDENED	Made broader
WIDENED	Added a lane to
WIDENED	Enlarged.
WIDENED	Amplified
WIDENED	Diversified
WIDENED	Like some highways after construction work
WIDENED	Dilated

WIDENED	Reamed out