Here is a
thought for entertainment and recreation for kids. The playground equipment for cars can be like mini-racetracks
and obstacles.
I like that idea! 
The car kids probably
play games that improve their driving abilities .
Not to mention that the race-track/course like playground would give the kids plenty of
exercise.
I think I
know this one now. I actually figured it out a while ago, I just kept forgetting to post.
I think the cars
sign contracts just like we do - with a pen. I think they attach a pen to their wheel in the same way as the
official in the races holds the flags, the camera cars hold their cameras and Ramone holds his paint brush. Maybe
the pen they use is some kind of spray pen that makes it easier for them to write.
Also the cars do use paper.
Doc has lots of paper and binders in his office. And one of the paintings in the court room shows a car with a
book.
Another thing I have thought about is cars who have rear view mirrors. It must be like having eyes
in the back of your head 
. I think the mirrors create an image in the car’s brain system so that they know
what is behind them without looking. It must be difficult to sneak up on a car like Mater 
.
Yeah - Good
thinkin’!
(Snort) Haha! That’s pretty funny! I
wish I had eyes in the back of my head like that!
To answer question seve, I think they dip their tire
in ink then press down on the paper.
I’ve always pictured it as them
“rolling” their tires on wet cement…
But I don’t know! 
another question…
it hasn’t much to do with “physiology”, it’s more about habits and culture in CAR world.
what kind of jewellry or “body decoration” do cars wear?
on the one hand, we have piercings (jason the pickup, one of the evil-doers in “the nature of fear”), then we’ve got pinstriping tattoos (sally), and last but not least the “engagement rim” (already mentioned in one of the fan fiction stories).
what else? (i’m not talking of gold-plated bumpers, etc…)
I guess car modifications like the deliquents were forms of jewellry / body decoration, so you are looking at body kits, spoilers, rims etc.
A car could hav ear rings! On his/her rear view mirrors!
I never really enjoyed the idea of cars having earrings , to me it’s like putting one on my dog .
I think stickers would take the place of jewlery .
Just something I been thinking about since I work in the medical field, regarding checking the gauges, they can’t see inside themselves anymore than we can without a doctor. So I would assume they would have their oil pressure checked like we have our blood pressure checked and they would have other diagnostic tests, which is true for real cars too.
Here’s another question. What is racing such as “the Piston cup” the equivelent to? Is it the car equivelent to foot races such as the 100 meter dash? or is it literally the equivelent to our car races?
Well I would like to think that it is more of a cross country race on a track, but I think it can be equivelent to our own car races.
I posted this on another board in response to a question about car musicians.
Perhaps they have finger-like appendages on the insides of their front wheels that they can use. They keep them tucked in most of the time. I mean, why not? 
I think most cars, when it comes to playing instruments could probably play a horn.
Hehe, that’s a very interesting theory!
Not unlike most people who can play the radio really well.
Drewster: Ha ha ha! That’s pretty funny! Yep, a radio would be easier, but it has such a limited life though.