>> when we went from 4 feet persecond to 3.5 feet persecond, that took about eight years, so that wast a time when we weren't doing as much signal timing. i think we'll be able to do that quicker, because we're doing the downtown area as a well, which includes the western addition, north of market, and south of market, which is already about a third of our system. we're working on implementing that change, and looking at major corridors like geary boulevard to change that, and we are doing that on ocean boulevard and other sensitive vision zero corridors. we'll be able to get there quicker, but i don't have a timeline because it somewhat depends on staff resources and how many intersections are we touching? because each time we touch an intersection, i will make those changes. >> supervisor yee: when can we get a timeline? i know you're saying it depends on the resources. for the resources that we have now, what is the timeline? and then, if we can get additional resources to speed it up. i mean, i won't know if it's worth trying to get additional resources without knowing it's capabl