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@MaxFX: In case you miss it in my post, Ive copied here. Thanks for all your help/advice. Much appreciated.

@Reluctant Addict: I've left a comment in your post. Let me know if this is indeed the issue, otherwise we have to look further.

Hi Max. Im hoping you might be able to take a look at a problem I've got. If you have time, pls take a look at my post on the CS Discussion board of 8 Jan entitled "Metro Bug". Much appreciated....

thx max for the link of assets without required dlc

@SuperSharks: Thanks!! The reason for the DLC requirement most often comes from the use of the 'Two-lane Highway' from the Mass Transit DLC. In order to apply 'lane mathematics' the use of that highway is necessary. Because that particular road is from the Mass Transit DLC, the Mas Transit DLC becomes a requirement.

But I've also made interchanges with the 'Concrete Highway' assets by Clus. These do not have a DLC requirement: https://steamcommunity.com/sharedfiles/filedetails/?id=2931740419