Hello,
I've had mostly positive experiences with melectro's Highway intersection mod. However there are some points which are known to cause congestion, particularly on and off ramps, plus there aren't other variations such as diverging diamond, four-way stack, clover mill, or trumpet interchanges which are more suitable for faster-higher-volume traffic. I'd also be interested in creating more roundabout variations which perform better than the vanilla ones. If anyone is interested please let me know how you can help.
