White cargo vans/service vans/pickup trucks with trailers/Taxis
The people behind the wheel of those work vehicles are the most common dangerous drivers. Bottom line. None of them received any additional training like police drivers would, yet they are always rushing about in traffic.
I can even tell you what they'll be doing... talking on a phone, wandering in the lane, rushing through intersections, trying to eat, write and drive, squeezing(in a few cases literally pushing me) through intersections and they'll be blowing through stop signs at cross streets.
If I had to pick out a regular vehicle driven by unskilled drivers it would be the pickup truck.
Recently I conducted some incognito automotive profiling at an auto show, the results were stomach turning!