Griego. Hi, everyone. Im frank mallicoat. And right now, caltrans is hard at work on a section of interstate 280 in san francisco. All southbound lanes are closed from 4th and king streets past mariposa street to the pennsylvania avenue on ramp. The closure continues all weekend allowing time to replace a crucial hinge on that elevated roadway. Kpix 5s cate caugiran has been following caltrains progress all morning and joins us from the work site a normally busy stretch of roadway now devoid of cars. Reporter yes, michelle. Its always eerie standing in the middle of the highway without any cars on it. Typically, on southbound 280 theres usually about 60,000 cars but if you take a look now its just caltrans workers. Sorry workers have been at it overnight trying to replace a bridge hinge. The purpose is to make roads safer in an earthquake. Caltrain gave us this up close look at the project. They have to shut down all lanes because to get to the hick they have to take out part of the fr