Remember the Versailles wedding tragedy of about 15 years ago? There was a third-story event hall in Jerusalem called "Versailles" which was hosting a wedding, and the floor suddenly collapsed, killing a number of people. At the time, there were the usual people talking about how it was a Divine punishment for mixed dancing, or lack of tzniyus, etc. I recall my late publisher Rabbi Moshe Dombey z"l marveling at how they were missing the obvious. The hall had been constructed using the "Pal-Kal" method - a way of building cheap and quick. There was no need to divine any cause other than the obvious: It is dangerously irresponsible to look for quick-and-easy shortcuts in something as serious as constructing tall buildings. And responsibility in such matters as construction is also a Torah obligation, be it the mitzvah of maakeh or venishmartem es nafshosechem.
Driving a car - a potentially lethal device - is also a serious business. I recall once seeing a responsum from one of the Acharonim (I'd be indebted if someone can provide the source) about a wagon-driver who got into an accident and killed someone. It was ruled that he has to fast twice a week for several years, support the victim's family for the rest of their lives, and pray for forgiveness every night for the rest of his life. We tend to think of Torah obligations as being davenning, learning, maybe even tzedakah, but driving safely and responsibly is also a Torah obligation. In that spirit, I am presenting a very, very disturbing video about texting while driving. It is very uncomfortable to watch, but if you ever text while driving, or even talk on a cellphone (and using a hands-free unit is almost as dangerous), you must watch it.