- WIDEN
- Dilate
- Enlarge (as a roadbed)
- Gain some unnecessary weight
- Open up
- Grow bigger
- Expand
- Spread
- Grow broad
- Broaden
- Improve the road, in a way
- Let out
- Ream
- Go from two to four lanes
- Add a lane to
- Change, as from two lanes to four
- Change the channel?
- Improve, as a road
- Gain weight, maybe
- Enlarge
- Modernize, as a highway
- Add lanes to
- Spread out
- Enlarge, as a road
- Add a lane to, say
- Make broader, as a highway
- Add a lane to, as a highway
- Alleviate traffic on, perhaps
- Increase in girth
- Add capacity to, in a way
- Expand, as a highway
- Extend
- Improve, as a highway
- Make broader
- Stretch
- Add lanes to, as a highway
- Make larger.
- Amplify
- Expand laterally
- Dilate; expand
- Enlarge, in a way
- Do a road job
- Ream out
- Opposite of narrow
- Add a lane
- Expand horizontally
- Change, as from two lanes to three
- Become broader
- Add more lanes to, as a highway
- Add more lanes
- Spread horizontally
- Get broader
- Increase, as a gap
- Extend throughout
- Expand, as a road
- Extend outward
