Reaching for the handy-dandy copy of the vehicle code I keep next to my bed.... BTW, I'm not kidding; it's at the front of my bookshelf. Given the number of traffic laws I break, it pays to study a bit.
Also, it's a really great deal. $3 gets you the complete Vehicle Code and an appendix that's sorta like a "California Codes: Greatest Hits". This appendix contains the best of the Penal Code, Health Code, etc. This organization makes a lot of sense. After all, if you break the Penal Code, it's likely to be a simple, 3 digit, "don't rob people" sort of law. On the other hand, traffic officers love giving out cites for 5-digit-and-3-subparagraph bullshit like making a left turn in a business district during school hours.
So here are your answers:
crow:
one hand on the bars:
I know there is something in the vehicle code about carrying packages, but I can't find it. From previous readings, I believe there is no law against one hand (or no hands) riding, except when holding a package. Reckless driving and other laws may apply.
SpeedyCorky:
U turn at a stop light & U turn at a 4-way stop sign:
Both are allowed fron the leftmost lane.
[traffic signals are lights, traffic devices are signs]
22100.5. No driver shall make a U-turn at an intersection
controlled by official traffic signals except as provided in Section
21451, and then only from the far lefthand lane that is lawfully
available to traffic moving in the direction of travel from which the
turn is commenced. No driver shall make a U-turn at an intersection
controlled by official traffic control devices except from the far
lefthand lane that is lawfully available to traffic moving in the
direction of travel from which the turn is commenced.
21451. (a) A driver facing a circular green signal shall proceed
straight through or turn right or left or make a U-turn unless a sign
prohibits a U-turn. Any driver, including one turning, shall yield
the right-of-way to other traffic and to pedestrians lawfully within
the intersection or an adjacent crosswalk.
(b) A driver facing a green arrow signal, shown alone or in
combination with another indication, shall enter the intersection
only to make the movement indicated by that green arrow or any other
movement that is permitted by other indications shown at the same
time. A driver facing a left green arrow may also make a U-turn
unless prohibited by a sign. A driver shall yield the right-of-way
to other traffic and to pedestrians lawfully within the intersection
or an adjacent crosswalk.
Unnecessarily complicated question about ROW at an T intersection:
Driver on the through road has right-of-way.
21800. (a) The driver of a vehicle approaching an intersection
shall yield the right-of-way to any vehicle which has entered the
intersection from a different highway.
(b) (1) When two vehicles enter an intersection from different
highways at the same time, the driver of the vehicle on the left
shall yield the right-of-way to the vehicle on his or her immediate
right, except that the driver of any vehicle on a terminating highway
shall yield the right-of-way to any vehicle on the intersecting
continuing highway.
(2) For the purposes of this section, "terminating highway" means
a highway which intersects, but does not continue beyond the
intersection, with another highway which does continue beyond the
intersection.
donoman:
Right on red from a middle lane.
Legal from any lane.
21453. (a) A driver facing a steady circular red signal alone shall
stop at a marked limit line, but if none, before entering the
crosswalk on the near side of the intersection or, if none, then
before entering the intersection, and shall remain stopped until an
indication to proceed is shown, except as provided in subdivision
(b).(b) Except when a sign is in place prohibiting a turn, a driver,
after stopping as required by subdivision (a), facing a steady
circular red signal, may turn right, or turn left from a one-way
street onto a one-way street. A driver making that turn shall yield
the right-of-way to pedestrians lawfully within an adjacent crosswalk
and to any vehicle that has approached or is approaching so closely
as to constitute an immediate hazard to the driver, and shall
continue to yield the right-of-way to that vehicle until the driver
can proceed with reasonable safety.