Cities Skylines traffic jams - because of memory shortage??

Hi all, ive been playing cities skylines and im in my first game (city). After I reached around 100.000 ctizens the traffic in my city started acting strange;
-Cars and trucks would just stop in the middel of the road and do nothing for like 10-12 seconds and then continue driving. This causes a lot of unnecessary traffic problems. (circled the situations)



Ive have actually SEEN this turbo-exchanger work like a charm... before the strange acting of traffic

-Also, my trains cant seems to leave the city fast enough, they just wait for each other to disappear beyond city limits but this goes at a very slow rate.





Can this be because of memory shortage (only 8gb here on a i5) so too many cars have to recalculated their route?
And cant the trains leave because of memory shortage so it cant process the actual goods going out fast enough?

Do others face the same problems?

 

The cars stop and others cars just drive on in lanes next to them. The circled areas is where the cars stopped moving as the rest is still driving, except for the line of cars behind them of course.
Also, traffic is converging in a very strange way as cars change lane (and hold up traffic) to get immediately back to where they were driving

 

I found the problem in the Traffic ++ mod.
I had improved AI turned on, when I turned it off traffic started moving again... but now only using one lane again.

Also I noticed that when you build a highway, do so in large pieces. Small pieces will result in cars treating every piece apart wich will allow them to switch lanes at every piece.

In this picture I had build the bridge and build the turbine interchange, i connected them with later with a small curve. I got major traffic problems as cars would switch lanes at the very last moment beforee the interchange. I rebuild the bridge with curve as one piece and the problem was solved.


Trains still cant seem to leave the city with normal speed as they still stop and wait at the edge of the map to go out of sight

 

I "solved" the "train traffic jam problems" by building stuff like this outside the city limits...




a real shame.....