How did they know that Michael would follow the truck? SPOILER
Basically Michael goes to the payphone his gf was last alive at, and thinks what could have happened. A truck then drives by that he thinks is mysterious, and so he decides to follow it. We later on then find out that it was the villain's plan for him to follow the truck.
However, how did the villains know he would follow the truck? It is just a normal looking delivery truck driving down the road. You see dozens of these things on roads all the time. There is nothing suspicious looking about it, and it felt completely implausible that:
1) Michael would find this truck suspicious
and
2) why the villains would think he would find this truck suspicious
It was just a really bad plan that worked, when it wouldn't have. Unless I am wrong?