At this past Monday’s hearing on Vision Zero [http://transalt.org/issues/enforcement/visionzero], NYPD Transportation Bureau Chief Thomas Chan [http://www.nydailynews.com/new-york/thomas-chan-named-head-nypd-transportation-bureau-article-1.1618368] acknowledged roughly 200 positions for crossing guards across the city that haven’t yet been filled. District 44 Councilmember David Greenfield [http: