It is like carnuding any place else, other than it may be easier. It is wide open spaces, making the drive easier. You can see anyone coming for a great distance and any problems. The border patrol has two stops. One at the state line, which is often closed. They are checking for fruit and vegetation and wetback cargo. I've been waved through, girl draped in a towel, girl holding dress over herself, towel draped over my crotch, pants draped over my crotch. There is one, not always open, as you get up the hill around De Anza that is only looking for wets and drugs. It hasn't appeared to cross the mind of the guy who waves, but people who smuggle, usually don't do it naked. There is plenty of due warning as you approach the road block. People need plenty of time to slow from highway speeds to a stop.
The laws are what they are. Just know them and don't let anyone see your genitals. Also, remember that people are coming from the beaches and the river, the dunes and it is hot and they wear bathing gear, light clothing, no shirts, but then they are looking for alcohol consumption, if you look suspicious, or fit the secret profile. They are 6 million Zoneys as well as Californians.
A piece of park, a walk in the cake.
Jbee