@VNDK8R thanks for the report. Frankly I have no idea what it means, however as soon as I have time I check in my CSL what happens :-)
However, I have been working on a new update for a long time, there is still a bit of patience before I have finished it, so I do not think I will be able to fix it quickly, in case I also find the issue.

An exception occured during NetAI simulation step.
Asset: 2199843164.Highway Elevated1
SegmentID: 33439
Type: RoadBridgeAI
Severity: High

System.TypeLoadException: Could not load type 'Problem'.
at (wrapper dynamic-method) RoadBaseAI.RoadBaseAI.SimulationStep_Patch2 (RoadBaseAI,uint16,NetSegment+) <0x01d1b>
at HealkitMod.Patches.NetManagerPatch.SimulationStep (NetAI,uint16,NetSegment+) <0x0004d>

@Daяқ|мaѕta As designed. Ground Segment don have light. This is because the ways taken as a model are built in this way. so as to reflect the real motorways taken as a model, which have no lights except at junctions or in particularly dangerous areas. However, the future version 5 in development will keep this feature but will have a placeholder lamp that can be modified at will through the Network Skin Mod

For some unknown reason, the street lights don't show unless I change every single node manually to custom

@Ranazomic For sound barrier I already talked to another user about it... I'm considering what to do, Right now.

There is no way to control that aspect. Is a limit of CSL. The only smooth transition I have managed to get is between elevated and bridge but only if no other roads are connected.

Love it, could you add a version of all the roads with sound barriers?

Also if possible could you improve how intersection/road change handles slopes? right now they always become flat