Duncans Mills CA to I5 directions

I just got back from Duncan Mills a few hours ago. But I can't answer your question on best way to get to 5 without knowing which way you're going. Time of day would also make a difference too. Highway 37 is having major construction and was close all weekend. So since I was going South when I got to I-5 I took 101 to 580 and across the Richmond Bridge and then followed 580 all the way to 5. That would not be the best way to go during commute hours. It was bad enough going on Sunday afternoon.