our city traffic engineer ricardo laya has developed some data that will help us target the resources where they can be most effective. but a great partner that's really brought a kind of higher level of data analysis into the picture is the mta's co-lead of the mayor's pedestrian safety task force, and that's the department of public health. so, we're happy to have thomas aragon here from dph. (applause) >> good morning. thank you for being here. one of the ways that i think about this is that pedestrian safety is an important public health issue. and the way i think about it is that i'm raising three children here in the city. i have a 16-year-old, a 15 year old, and a 12-year-old. and what we want -- we want the city to be safer than whether they're biking, walking, going to school. and so that when we invest in pedestrian safety, we're really investing in the future of our city in our children. and, so, from our perspective, pedestrian safety is a public health issue and it's really important for us to invest in making sure that it's safe. the other thing to think about when we th