mr. maguire? >> that is it. >> any questions or mr. maguire? >> i have a couple, but you can go ahead. >> please. >> thinking to the two most recent fatalities you spoke of on april 23rd and may 1st, you mentioned that we had already implement did some of the basic safety improvements to those places, so i guess, thinking along the same lines of the conversation we had earlier, how do you make sense of what happened, and what are your lessons learned knowing that we had already deployed some of the more basic tools and interventions in those intersections? >> good question. this is probably a good time to remind ourselves that while our approach in san francisco is to lead with engineering and lead with design because that is the way to get permanent, effective speed reduction in safety changes, there is a key role for enforcement, a key role for education in these efforts as well. the seventh street crash is really anomalous. i've never seen a fatality resulting from that kind of behaviour in my five years here, so it is a little hard to draw