Just looking at the thumbnails, it looks like there is nowhere near to enough overlap between adjacent images.
Things that are just coming into view in one image are right alongside you in the next image, and then far behind in the one after that.
The difference in scale and perspective angle mean metashape has no chance of finding a good match most of the time, and the trees in the central reservation mean that there will be next to no matching between the parallel survey lines.
I would suggest increasing the number of images by x3!