Just before dawn on Monday morning, Caltrans achieved a major North Bay milestone — although there are still a few signs on Highway 101 indicating otherwise. Nor, despite identical, out-of-date signage, does the right lane on northbound 101, across the highway from the old Birkenstock building. That’s when drivers of electric vehicles will lose their carpool lane privileges, forcing many of those EVs into the regular lanes. Where are my tax dollars going?”The new carpool lane hours aren’t necessarily permanent, said John Goodwin, a spokesman for the Metropolitan Transportation Commission, which coordinates transportation systems across the nine-county Bay Area. Night-time work will continue this week, through Saturday, on northbound 101, just north of Atherton Avenue, between 8:30 p.m. and 7a.m.