1.   Downtown sidewalks have been widened.

2.   Sidewalks had been widened.

3.   The city designed the program to lure private investors to the area by rebuilding streets and bridges, widening sidewalks, demolishing dilapidated buildings and planting flowers and trees.

4.   The streets were cleaned, sidewalks widened, lights installed and trees planted.

5.   He also widened sidewalks and prohibited parking on a main shopping avenue, initially provoking the ire of merchants but eventually winning people over.

6.   Widening the sidewalks to make it easier for pedestrians, is one possibility.