I can answer no. 10
from www.snopes.com:
We posed this question to the Los Angeles Times' "Street Smart"
column back in 1994, and -- once convinced it was a legitimate
question -- they responded:
. . . the mail truck does not have the right of way. Like other
vehicles and even pedestrians, it must pull to the side of the road
to let the emergency vehicles pass. Our answer comes from Bill
Madison, a spokesman for the California Department of Motor
Vehicles.
Everyone else we queried thought the question was unique, to say
the least.
"That's about the craziest thing I've ever heard," said an officer
with the Los Angeles Police Department's Valley Traffic Division.
"I don't even know how people have time to think about stuff like
that."
Undaunted, we pressed on.
"OK," a California Highway Patrol officer said in a tone that
suggested he didn't take the question seriously.
Finally, Madison responded. "The mail truck is not even in the
running, unless the guy is a complete idiot," he said.4
A similary query posed by us to the United States Postal Service
produced the reply that the USPS was also unaware of any laws
granting mail trucks right of way status.
Okay, so if the mail truck doesn't have the right of way, then who
does? "Street Smart" also provided an answer to this from a
California DMV spokesman:
. . . once the mail truck is safely to the side of the road, the
question becomes trickier. Madison speculated that dispatchers
would solve the situation before it arose. If they did not, he said
it would make sense for the police car to go first and then the
firetruck. The ambulance would go last, he said, because if "five
seconds makes a difference, you probably aren't going to save the
guy anyway."4
We have to wonder about that answer. If five seconds makes a
difference, the fire department probably isn't going to save the
burning building, and the police probably aren't to catch the
fleeing criminal either.
A couple of weeks after the "Street Smart" article, another astute
Los Angeles Times reader provided his own answer:
I am glad that it was established that the mail truck would not
even be in the running, but I am disappointed that it was not
pointed out that Section 21806 of the California Vehicle Code makes
that clear.
Section 21800 answers the question of which of the remaining three
vehicles has the right of way. To make it short, the vehicle to the
left of the mail truck has the right of way.
Since everybody has to yield to the vehicle on his right, whoever
sees the mail truck on his right gets to go first.
Easy, huh?