It was recently posted on the BikePGH Message Board that a young woman had a close call with an unsavory character on the Jail Trail. When you’re riding at night, especially when you’re alone, consider alternatives to the trails. Parts of Panther Hollow and most of the trails along the rivers are poorly lit and removed from the public eye. Light and witnesses are probably the two biggest things in your favor when it comes to avoid being robbed, etc.
For those of you who haven’t read this yet, it’s a good rant on the dangers of separate bike paths.