So I got a response from two people from Arlington County. One person said he would personally check out the location and come up with some possible signage improvements. He also noted that the leaves were cleaned up regularly during fall (something I duly noted today as it was a lot better there) but he would try to see if the crews would give that area some more attention.

Another person said he would recommend to VDOT using some materials there that give tires more friction and grip on the pavement.

You can send comments to Arlington County about the Custis Trail to: trails@arlingtonva.us They are definitely responsive.

And finally, the person mentioned in the "Express" article told me that wiped out at the same spot as well, go figure!