They'd probably slam the border shut. Which is why I would not evacuate south.
I'd go north or head toward the ocean.
I went for a drive east of Del Sol area, to a hilltop overlooking 805 and 905. Both are open, according to my neighbor 905 was closed for a short while. I saw several very very small brush fires a little bigger than campfires and no flames, smoke only, and about 6 firetrucks. nothing appeared to be threatening houses at this time. The small fires were spread out on two different hillsides, very strange. No winds in the area.
I could not see all of San Ysidro but it appears to be ok now. I feel better but will probably not sleep well tonight in case things change...we are due one more day of winds...