Of course it doesn't stop there. The ripple effect reaches friends and friends of friends, especially when someone is killed.
Teenagers spend a lot of time with and talking to their friends.
In fact, at that time of life, I'd go so far as to say their friends are more important to them than their family.
So going with their friends to an expo like this and talking about it, maybe all agreeing that they will never ever get into a car with a drunk driver, has got to be a good thing.
As our roads become more and more congested motorists need to ensure they are concentrating only on the task at hand ... driving.
I'm not just talking about teenagers here, every driver has a duty to ensure they get from A to B safely without harming themselves, their passengers or other road users.