Heya Ladies:
Here are my thoughts on all of this, some of what I am saying has already been mentioned by the other members that have commented on this thread.
Not just running in the dark ALONE, which is definitely not advisable, this is a no-brainer.
It is also not advisable running alone day or night on isolated trails, tree covered parks, and rural country roads that have very few homes and very little traffic.
There have just been way too many NEWS stories for any of us to ignore about the daytime disappearances of women running, jogging or walking alone and to not understand that for the most part, a woman running or walking alone just about anywhere, day or night, where a lot of people are NOT nearby and around, is not a good idea.
Even in town and populated areas I almost always have a walking/running buddy with me... safety in numbers... where legal, pepper spray is good to carry, also a loud whistle, and always have your cell phone with you..
If I do run, jog or walk alone, which is not very often, it is almost always in town, on town streets where there are nearby people, stores, businesses and street lights.... especially where I am living... in the winter time here there is much more darkness that there is daylight.... even in the late morning and early afternoon.
I never go hiking into the hills and mountains alone, and I always have a walking buddy or two with me when enjoying the great outdoors wilderness areas...
Wherever you are and wherever you go, always be aware of your surroundings and of the various people and vehicles that you come across. NEVER wear earbuds or headphones listening to loud music while hiking, running, jogging or walking.... obviously you would not be able to readily hear people or vehicles approaching you from behind.
A additional note: It you do go out alone, it is very wise to tell someone, a friend, a neighbor, etc, of your plans, including the route and times, and when you plan to return home.
Be smart, be careful and be safe.
Hugs to all,
Danielle