Can you read for extended periods in a car?
Not even really short periods of time.
I can read for extended periods I any moving vehicle; cars, planes, boats, helicopters, I don't understand how reading can cause some people to get motion sickness. I also don't understand how anybody gets seasick on a boat but that's another story.
I get carsick if I read in a car
CD books are great. Or greatest speeches CD's
Yes. I used to get very carsick when I was a child, but fortunately that stopped at some point.
But DO I read a lot in a car? No. Especially if I'm the only passenger. I'd rather talk with the driver.