http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2005/09/21/BAG7RER9L61.DTL
had an article about the new Central Freeway on-ramp (i've snipped a lot
of it for brevity and combined some paragraphs to keep the line-count
down, so please see the URL):

It's your typical "only in San Francisco" story, one that pits
cars against bicyclists, politicians against planners -- and
right-turn bans against reality. The issue: a $26 million
Central Freeway on-ramp, at the foot of the newly built
Octavia Boulevard, that you can't turn onto from the city's
main drag, Market Street.
snip
Once work got started, bicyclists -- a potent force in city
politics -- took aim at what they saw as a menace to the
two-wheel crowd. City traffic officials didn't buy into their
demand for a right-turn ban. So the San Francisco Bicycle
Coalition and others took their case to the Board of
Supervisors
snip
The reality is that motorists are saying "to heck with this,''
and are making the turn anyway. At least one bicyclist has
been hit by a right-turning car since the ramp opened two
weeks ago, and there have been scores of close calls.

Whatever they decide, we did find at least one bicyclist who
likes the new freeway ramps landing at Market Street.
Sistar Aquadivina, who works at the ACT UP SF pot club on
upper Market, says, "It's great for business.''

--
My real name backwards: nemuaZ lliB