I'd assume this program looks for commonalities among the areas where the crimes have been. Like if they all were heavy with Swedish businesses, the killer's home is assumed to probably not be in a Polish neighborhood. Also I'd bet the areas are now staked out with police noting license plates and looking up the home addresses to crunch into this program to get an idea of the general locale of those who frequent these areas.
However for these killings I wouldn't rule anything out, including the scenes of the crimes being deliberately selected at random on a map, and researched individually, to throw off traffic profiling like this.
I don't think the traffic profiling is THE MOST IMPORTANT part of this and I think the vehicle is in the next parking lot away and the sniper himself is on foot for the actual scenarios.
If they use walkie talkies, the one in the vehicle could be giving directions as to what is arriving at the scene and which way the guy should walkout to avoid witnesses. The guy in the vehicle has several choices. If he gets trapped, the sniper just keeps walking. The vehicle is for lookout more than transportaion.
It's really several minutes until people get their senses about them and their concentration is on the victim.....Again the sniper just keeps walking....He might get a glance but he is doing what most are doing...getting away from there.
Sac