Recently I cut off my vehicle's motor while waiting for a coal train to pass through town. Even though I had not had any indication there was a problem with my battery, my car would not start when the crossing barriers rose to allow traffic to continue. After listening to five minutes of constant honking, several kind gentlemen pushed my vehicle off the main thoroughfare. Shortly thereafter, a police officer stopped to offer assistance at which time I realized I no longer had jumper cables in this particular car. As a result, I had to wait for a family member to come to my rescue.
While common sense may dictate a set of jumper cables should be in every vehicle on the road, it does not mean everyone has a set (obviously). There are some other items drivers should keep in their vehicles at all times. A quick check of my car revealed I already had six of these ten suggested items - including jumper cables. Check your vehicle against this list, then add the items you are missing.