HW4 side cameras have slightly wider field of view which helps at T intersections, and they have much higher resolution and color, which helps with estimating distant vehicle speeds. The speed increase of the HW4 computer will also help with making faster decisions, I’ve found my HW3 computer reacting slower than me sometimes (not always, of course). It’ll be a worthy upgrade whenever FSDb gets released for it.My feeling is UNLESS you get the upgraded and more cameras all HW4 does is process images faster.