If you can't get out for a ride, then you at least need to drive it. As noted above, you want to know where the potholes are located. https://www.youtube.com/watch?v=h_YIXnZV3EU If you haven't watched this then I highly suggest it. I did a good 20 to 30 trainer rides watching this on my ipad. That way I knew all the turns before I even got there. And also knew the areas to pay attention to when I went out driving the course. For me the sketchiest part was 34th Ave coming down from the Legion of Honor. Not the coming down part(except the turn at the bottom of the hill), I was fast enough on the swim to be alone, but by the time I came back you have a lot of people coming down the hill, 2 abreast and sometimes someone trying to pass on a very narrow stretch of road.
This one will give you better feel for congestion in some areas.
https://www.youtube.com/watch?v=lboN5SmsdaA