Does anyone know of any high speed downhill steep routes where you can build up speed and ride for a long time?

I know one like meadowhead down to queens road.

Im taking about proper steep.

what is a built upper?
Sounds like a special shoe for someone with a deformed foot.

Built upper is when you get the rythm/momentum going like kinetic energy.
Example ; once you pop you cant stop

I used to do built uppers in my car and then overtake people.

You could try East Bank Road or Myrtle Road but that's a bit short. What about Prince of Wales Road? That's a long one.

I'm sure that Bill Tuppers gave up cycling a while back.