Why is the limit posted at 25mph? School Zone (see 22352(b)(2))? Residential district (See 22352(b)(1))? Business district(See 22352(b)(1) as well)? Is it near a senior center (See 22352(b)(3)) or a public park (see 22357.1)?
Speed traps would not apply to any of those cases. Simply because all those zones require a 25 mph limit are statutory speed limits and the great likelihood in all of those cases is that the speed limit was not determined by way of a survey, instead, it was simply posted by looking at abutting property and establishing that 25 mph limit by statute.
This, in my opinion is properly indented CVC 40802. Just don't worry about the different colors, I was explaining how those subsections apply to different circumstances none of which apply here.
(Assuming you answered "yes" to any of the "is it" questions I asked above, that would then be the reason that this segment of roadway would not fall under the scope of 40802(b), for 2 reasons: (1) because none of the code sections I cited above as the authority behind each 25 mph limit is listed under 40802(a)(2), and/or (2) because of those locations are excluded under other subparagraohs under 40802.
Whether the 5 year, 7 year or 10 year provisions apply is dependent upon the date the most recent survey was conducted. In this case, and if any of the conditions (abutting properties) are as described, then you won't find a survey/
Well, if it is a statutory speed limit, then by "functional definition" a 25 mph limit is what the law requires it to be... And therefore it is not low or high but exactly where it must be!