CO/Paradox have released the 1.1.1b game patch (1st July 2015) and it's caused some errors, more details found here:

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=472481937

Problem: When loading a save game, the error message above is shown and the game is horribly broken (grey untextured roads, bridges explode, buildings disappear, game timer stops working).

Cause: It's due to unsubscribing a workshop vehicle asset that was assigned to a transport route or service building. This appears to be a bug in C:S itself, and will affect all users regardless of what mods they are using.

Solution: See "Object reference not set to an instance of an object" section in Main Troubleshooting FAQ.


Problem: Vehicles randomly stop or start moving very slowly.

Cause #1: Metro station or track going under road

Workaround #1: Move the metro or road so they aren't overlapping.

Cause #2: Caused by T++ realistic speeds

Workaround #2: Disable the "Realistic Speeds" option in Traffic++ mod options.

Cause #3: Broken vehicle assets

Solution #3: Use Advanced Vehicle Options mod to investigate the speed of slow moving vehicles and prevent them from spawning to see if that helps.


Problem: Vehicles go off-road, often flying direct to their destination, but sometimes travelling through buildings and underground too.

Cause: We're still trying to track down what causes this bug, it seems to be affecting users who have both Traffic++ and Traffic Manager mods activated.

Solution: Press F1 to do a quick save, and once saved press F4 to load the save. That should clear away airborne vehicles.

Mac users: If your F-keys are performing system functions (like changing brightness) hold the 'fn' key while pressing them. You can make the F-keys work as standard function keys via System Preferences > Keyboard.


If the central area of your intersection has lost it's texture, that's likely a bug with Traffic Manager's pedestrian crosswalk tool; rebuild the intersection to return it to normal.

If lane arrows are wrong or distorted in first person camera view, that's likely a bug with Hide UI; return camera to normal mode and the lane arrows will return to normal.


FIXED: Republish your asset and it should now work. If not, let us know.


Please see the Cities Skylines Troubleshooting FAQ which contains solutions for pretty much every issue ever reported with Cities: Skylines (crashes, graphics problems, lag, broken public transport...)

Traffic++ users: See the Traffic++ main FAQ for solutions to common mistakes.