Shakey

Guessing but a cause could be from another city has a highway traffic jam and the alloy truck is stuck in it.

On that same note I couldn't keep traffic to cooperate reliably enough to use depots so I try to upgrade to ports as fast as possible cause then you can ship by rail or sea which like everything can be flakey but seems safer then by road. Granted ymmv if your region hasn't unlocked the storage you need.

Im game if our server would wake up from its primetime nap