put vehicleaihandlinginfo.meta in \update\update.rpf\common\data\ai

Changes:
-Sports car with the <AIHandling>SPORTS_CAR</AIHandling> in the handling.meta will drive much faster and harder than average, crap or truck driver. 
The highway cruising speeds in a straight road for each class is as follows (the speed were calibrated base on what I see others doing on real US highways, like in a 65 mph limit highway, most people do 75-80 mph, including trucks, and you occasionally see some sports cars blast by at +100 mph, so it makes sense):
Sports car flag : 100 mph with shorter braking distance compared to other flags (also set it at 100 mph because some cars may not reach that speed and the ai can get a bit crazy when is set higher and more accidents will occur...)
Average flag: 80 mph
Crap flag: 80 mph but with much less predictability and more accident prone.
Trucks flag: 78 mph with much longer braking distance.
The speed changes in accordance to the angle of each corner, so they won't be driving 80 mph in a 40 degreed bend...
Accidents are more prone with this mod and if you suddenly stop on highway, you will get rear-ended, but some may stop in time like in real life.
For best result combine with my custom handling.
Note: One issue I've found is that during downhill roads, like outside of Michael's home somtimes, some people may continuously rear end each other during a light or a stop sign, which I found to be quite hilarious and nothing really game breaking (don't worry, most will stop in time). This is probably due to the reduced grip from the handling mods and increased braking distance from this traffic speed mod. Another small problem is that with the new reduced grip, the ai may ram into trees on very tight hairpins in mountain roads.

*Also, as a friendly warning don't stand in the middle of the street as you are likely to get run over and suffer quite a bit of damage (especially on highways, where one hit could result in instant death...)