|Live to run another day.|
-a group or a buddy especially in the dark or on the trail
-a dog - don't have a dog? Borrow a neighbors.
-mace - you can find these at sporting good stores and running stores
-an ID bracelet - RoadID is a good one
-your phone - sporting good stores carry great belts and arm bands for your phone
-OUT ear buds. If you need them for keeping cadence, keep one ear bud out so you can stay aware of your surroundings.
Lastly...tell someone you are going on a run and when they should expect you back.