[BUG] Trade Depot Won't Export

I had what I thought might be the same bug, but when I selected the trade specialization so I could see where my freight trucks actually were/what they were carrying I noticed that, outside of my city borders at the point on the regional highway where the game seems to stop 'realistically' simulating traffic, all my freight trucks were stuck in an outbound line of traffic. And they were like that for as long as I watched- the line of traffic didn't move at all, the car at the very front point just stayed there. I watched for a while with no apparent change in the traffic situation.

This occurred with my city being Ceylon Steppes and the traffic backup starting just outside the entrance to Lapsang Landing. I can't imagine this not being some kind of bug, and it's rather cripping as I'm losing money every month without the money from trade.