The one that shows Generic Icons for Roundabouts ect looks like a white un-built house looking thing..? Seems its been a month or so its kinda an Important one no?
This isn't a simple fix afaik.
Custom icons are possible at the moment, but they aren't easy to add.
Also if you want to create custom icons for assets that have already been saved without one, you have to recreate the asset from scratch.
Even if and when CO are able to fix this, I doubt the ingame icons for the thousands of intersection assets in the workshop will look very good (probably just use the workshop icon if & when this is fixed).
By using
@T.P.B. 's method you can create proper icons for them, that are just like the icons that CO have made for each of their assets.
Check out my workshop items (and T.P.B's) to see what custom icons look like ingame currently
