Today (September 15):

In my neighborhood (Haidian, QingHe, YongTai neighborhood 海淀清河永泰园) police saturated the busiest intersection with at least a dozen cars and several flatbed trucks. They were stopping and checking motorcycles and electric tricycles (三轮车）and had loaded many vehicles onto the flatbeds, presumably impounding them. I thought it odd that many of the san lun che were mainstream delivery/courier vehicles (jd.com, SF, etc...). One flatbed had half a dozen R9 scooters loaded, all sharing one common feature: no number plates.

I wasn't brave enough to snap pictures, sorry!

The crackdown continues, so it seems. This affirms my endeavor to become fully licensed and legal before I dare ride on Beijing's streets. I think the consequences of a foreigner riding illiegally and being caught in that kind of a crackdown could be severe.