For car rides i don't think kids know respect when they are insanely bored and have been sitting for hours espcially since you are driving and can't do much to them on the road how can u punish them while on road for not listening??
Plus, reward-based systems are much more effective than punishment-based ones. Why would you punish your children for acting poorly when it doesn't work well and teaches nothing about respect? Respect is something you teach that has nothing to do with how you get your kids to behave, unless they already respect you enough to just do as you say.
AAAAAAWWWWWW YYYYYYYYEEEEEEEAAAAAAAAAHHHHHHHHHHH!!!!!!!