On Jan 28, 2011, at 7:01 PM, Gunnar Shogren wrote:

On Fri, Jan 28, 2011 at 6:00 PM, John Lozier <jl@harpingforharmony.org> wrote:
The moving gate (or gates) would not trap anyone, just hold them on one side
for a short while.

And what would keep those folks from just ignoring it and going around?
Like not using the cross walks in the first place?

Exactly my point, going around the gate what we want them to do. The gate provides a space for cars to move ahead, in the "lee" of the gate (or gates) slowly moving back and forth across the island. Gate provides cover for cars to pass first in one direction, then in the other.

A test of this would be for a couple of people to carry a 20-foot ladder back and forth during the rush hour, providing "interference" for cars to proceed.

Somewhat akin: elevators often employ a "nudging" action when passengers attempt to hold the doors open too long.

John Lozier
Morgantown, WV
www.harpingforharmony.org