Twitter is a great way to get important news and information out to a lot of people quickly. This is a powerful use of Twitter. When there is an emergency, think Twitter.
Twitter can help you get information out about an accident on a highway, for example. They can read the tweet and avoid the accident by going around. It can be used my authorities to inform the general public in case of a big emergency as well.
If you see something of importance to others, share it. It will save them some pain hopefully.
By the way, don’t tweet and drive. Pull over to make your tweet.