Gridlock caused by.... nothing?

[someperson42 0]

This gridlock seems to be caused by one school bus that just won't move for some reason.

[Superbacon 380]

Delete the road and rebuild it?

[someperson42 0]

This actually happened to me TWICE, in that exact same location. Quitting the game and reopening it fixes it (temporarily).

[Panos 29]

Make the affected road bigger, or start using T junctions more often. 

[Mdrizzle3 6]

It obviously broke down or ran out of gas...  It is probably because that intersection is so close to 2 others (even though those are turns, I think the game interprets them as intersections). Try reshaping it with curved roads.

[Catchin22 299]

If you have a bus stop there try moving it. It also looks like you have a ton of construction trucks. If you zone too much you end up with tons of moving and construction trucks flooding your roads.