add more ways to get on the highways (top map) - MAX 2.
Your blocks are very very long. shorten them. cutten em in half will do. might need 3.
Sidenote - does your dam work ?
Hard to tell from the one image (I can't tell if I'm looking at vehicles all lined up in the red areas or if that's just my eyes, or simply part of the road). As others have said (elsewhere) "red" traffic does not necessarily mean bad traffic, it just means that there is a lot of usage of that road, so take a look at the roads and see if the traffic is actually lined up for ages and teleporting out of the area or if it's working pretty smoothly and flowing okay then you need do nothing about it.
I would do something like this, I tried not to do too much damage to the surrounding buildings:
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