Are you actually PARKING there? Or, are you STOPPED there? In other words, are you pulling over in the turnout and leaving your car to hike, walk, or otherwise disappear from the vehicle?
Is this turnout on a numbered state or US freeway?
I agree with adjusterjack - a Google map link to the location might help.
In general, a "turnout" is to be used only to allow vehicles to pass. But, also consider this, the turnout is part of the "highway" and, if when you park and leave your vehicle, it obstructs that turnout in any way or presents an articulable hazard (which can be subjective), it could be towed pursuant to CVC 22651(b).

