If there is a queue of 17 cars in a single line how many cars have an even number of cars in front as well as behind them?

If there is a queue of 17 cars in a single line how many cars have an even number of cars in front as well as behind them?
An awesome brain teaser, this made my dumb brother sit for hours trying to solve this puzzle for twenty bucks! Hope you can solve it!! :) :)

Love,
Michaela <3

PS it took me one hour to solve this brain teaser!! I'm really dumb, lol!
PPS (I'm single!!!! and 20 years old!!)

Answer 2. Nine of them. Remember that zero is an even number.

PS it took 45 secs - please send the $20 to Shriners Hospital via your local Freemasons.
PPS I'm married and old - that's why I did it so quickly, not wanting to die halfway through.