The first map I'd like to show you is the proximity of the cellular tower pinged by Joe's cell phone in relation to Bryan Kocis' house (it's well within range):
After the murder, Harlow Cuadra and Joseph Kerekes would have had only one choice of directions to leave, and that would've been heading southeast on Midland Drive to Center Hill Road (there are no additional street entrances, or exits through Fern Knoll Burial Park to the northwest):
Whether Harlow and Joe went left or right, both Route 415 & 309 combine towards the southeast... either can easily take you to Interstate-81 and/or the Fox Ridge Inn:
... and a nice satellite view of Bryan's house while it was still standing:
Hope this helps.