There was no zipper lane Friday morning. And, the afternoon commute was zipperless, as well. Traffic was heavy because an estimated 4,000 motorists use the zipper lane to get to and from work.  The zip mobile malfunctioned, so the zipper lane couldn't be opened. There is a backup zip mobile, but that vehicle broke down over the New Year holiday. Transportation crews expect to have the backup zip mobile up and running by Tuesday. (Monday is a holiday - Martin Luther King Day).