Modern marathons such as New York, Chicago, London and Berlin have tens of thousands of runners and millions of spectators. Common courtesy for other runners becomes necessary when running in a densely packed crowd. Those employing a walk/run strategy or who are simply walking are encouraged to stay to one side, leaving the middle of the street for faster runners.

Runners in groups are encouraged not to block the entire street, preventing other runners from passing them. Two or three runners abreast is recommended. Large groups may consider single or double files.

Many marathons around the world have a time limit by which all runners must have crossed the finish line. Anyone slower than that will be picked up by the sweeper bus. In many cases the marathon event organization is required to re-open the roads to the public so that traffic can return to normal. Refusing to get on the bus could cause traffic hazards and would embarrass the organization.

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