 FACT: At the start of the movie, when Jackie and the commandos are  attacking the convoy, they do a visual survey with special  binoculars first. This shows people inside the vehicles via  individuals body heat. If this is the case, there should be certain  parts of vehicles that should appear as red, like a trucks engine  block which would have five times the human body heat easily. Also  friction would cause the tire treads to have some heat as well.