Coming from South 101 its pretty bad. A tad better from north but lately it has gone from bad to worse. At peak times in evening (5:00 - 6:00) expect 15 mins to just enter the city once you hit the exit.
At that time a jam in 92 east in the evening chokes the other two entry points to the city. But its just a bad design on entry from 101.
On the liquefaction part you are not alone. A lot of people mention it to me jokingly when I foster city is mentioned. Some seriously believe that a big earthquake will melt the city into bay:). Could be true. City is completely on landfill and I think the east and south side are seriously vulnerable to flooding.
a raised levee would be bad for city looks. Bay trail is a big plus for the city. And if they raise taxes it would not be good. City has already dropped the plans for high school and allotted the land to mix housing use.