I'm pretty sure you're not going to find any route 109 shields and the route 114 shields, if I recall correctly, we're only used on some temporary construction signs and should be long gone since Caltrans is in the process of completely rebuilding the 101/Willow Rd interchange.
Regarding the blog post, here are some additional nuggets of information...
* I have never heard of 237 being referred to as the Alviso-Milpitas Road but I guess it's plausible since the western part was called the Mtn View-Alviso Road. In fact, the exit sign from north 101 to west 237 still uses that road name (
https://goo.gl/maps/xgAZa43e7zH2).
* During the morning commute, the majority of the delays are at the 237/880 interchange where the 2 lanes from CA-237/Calaveras Blvd (and northbound I-880) merge with the 2 lanes from southbound I-880 all have to merge into 2 lanes to continue west towards Mountain View. Oddly enough, the conversion of the HOV lane to an Express Lane exacerbated the congestion because HOVs entering from Calaveras were no longer permitted to merge into the Express Lane (old HOV lane) until after passing Zanker Road. Current plans call for extending the Express Lane all the way to US 101 at which point, it'll probably become an "open-access" Express Lane like the ones on I-580 through Livermore.
* The conversion of 237 to a full freeway was made passible because of a landmark ballot measure passed in Santa Clara County back in 1984 that imposed a 10 year 1/2-cent sales tax to pay for the construction of CA-85, widening of US 101 and the upgrade of CA-237.
That's all I have for now. If I think of anything additional, I'll modify this post.