The Smoke Grinder Service Interchange
This is a very compact high volume service interchange, with no traffic lights or opposing traffic. It will move a lot of cims while taking up very little space in your city. I created it to solve the problem of cims traveling from one side of a highway to the other interfering with cims trying to get off of or onto the highway. Here, highway access is between the two surface lanes, which avoids having to cross opposing traffic to turn left, and allows through traffic to be diverted around the highway access on the 80kph outside lanes. The lanes for turning right off the highway are underneath the overpass. The highway distance from exit to entrance is only 21 blocks and all highway entrances and exits are at grade and low angle. The highway overpass is set at 9m.
Anyway, I hope you give it a try and tell me what you think.