About 25 million Americans used in-line skates last year, the group said.

They may use telephones and in-line skates, but not zippers.

A. The laws of New York City dictate only how people use in-line skates, not where.

It is legal, for example, to use in-line skates "on a public street, highway or sidewalk."

David Craig, a marathoner and speed skater, has been using in-line skates in Manhattan for four years.

Instead of using skates, special shoes are used that have very soft rubbery soles to maximize grip while running around.

He has been chosen for a cameo role in Nora Ephron's next movie, which will require him to learn how to use in-line skates.

Today, most roller hockey players use in-line skates, with wheels aligned in a single row (often called Rollerblades after the popular brand name).

Roller hockey is a form of hockey played on a dry surface using skates with wheels.

But he said the commission could not say how many people are using skateboards, skates or scooters.