Aidan Stanger wrote:

You'd be hard pressed to find a skateboarder exceeding 20mph. Even
cyclists don't all that often (normal cruising speed for most cyclists
is nearer 20km/h).

Saw two guys on boards riding down Park St. in Bristol (a long straight hill
on a main shopping street) last summer - they were overtaking freely moving
cars so must have been doing an easy 30mph... It was VERY impressive in a
'Jackass' stylee ;-)