1.   After work, as the traffic thins and the sidewalks clear, the real life of Teheran begins.

2.   Homeless men become the most popular people on the block if they volunteer to clear sidewalks and dig out cars.

3.   Seattle did the same and pioneered a no-sit, no-lie law to keep the sidewalks clear.

4.   Traffic policemen prowled in sidecar-motorcycles, enforcing a month-old law to clear sidewalks of vendors.