Intersections that are touching each other act as one large intersection, and only one truck can pass through an intersection at a time. Try to space out intersections. Note the intersection in the red box. Those two tiles count as one intersection.

Researching urban roads helps trucks move faster, one ways can help manage traffic flow, and bridges to make overpasses can help in other situations.

Trade routes can help by packing more products into fewer trucks. They will not be covered in this section.

Another option is to use manual destinations straight from producers- even if the building is in range of a warehouse. To do this, go to the destination tab of your gatherer/producer, and select a destination. If your building is using the auto warehouse, click the button on the left side to toggle auto/manual.