Hi, if I remember correctly, anything on the corporate campus of Intel is private. I believe there are “private property” signs at various entrances.

The majority of streets do not have any posted speed limit. Many streets may be covered by the default speed limit of 25 mph or 20 mph. I prefer to map speed limits based only on posted signs as there is less potential confusion, but other mappers will fill in speed limits based on their knowledge of default speed limits.

This was using Bing streetside imagery to look at the signs.

osm.wiki/Bing_Maps#Streetside_imagery

For example, you can clearly see a 35 MPH sign here:
https://www.bing.com/maps?osid=c0bd08e3-d58d-4bbe-9e12-bdb9f30f5785&cp=44.983008~-123.026702&lvl=19&dir=189.13634&pi=-7.2134066&style=x&mo=z.0&imgid=588ad3ed-9c3d-4bd0-ba98-c9e3eb497a78&v=2&sV=2&form=S00027

From this, there is a Node created here:
node/5836862418

The maxspeed=35 mph tag is also added to the adjacent Way. A single speed limit sign is not enough to determine the speed limit for the whole road, so I did traverse the whole road looking for other speed limit signs.

Thanks for updating the map. Let me know if you have any questions.