So far, the longest I have ever been stranded in traffic was seven hours. Other travelers have run into situations much worse and spent a couple of days or more waiting for relief. Traffic accidents, floods, blizzards, tornadoes, and earthquakes can flat out stop your world miles from home or help.
During emergencies, food provides comfort as well as sustenance. Aside from the disaster-gear that never leaves our vehicle, for long road trips we carry enough food to last two people at least three days. None of our provisions, other than the water, qualifies as health food but it is nutritious enough to keep us going.