Kinda but not sure if its the correct way to do it... but I was able to get there and to the slums and motel and truckstop diner by going to the brick building near the security checkpoint at night over and over until I got grabbed and then lost the fight with the assaulter (get raped) then I woke up behind the pub, but then the option to go to the highway/truckstop was the only available option. After that you can go to pretty much any of the places (truckstop diner, motel, slums, the diners bathroom for gloryhole options, etc.)
So very long way of saying get raped in the checkpoint area near Alison then you will wake up there.