Hello willkmis,
This is my mistake! I based the Highway=Trunk marking off of the nearby CA 41 which is marked as Highway=Trunk between East Central Avenue and CA 46 even though it does not directly connect Fresno with another significant population center. Having reread the California/2022 Highway Classification Guidelines I now notice that CA 180 is curently NOT proposed to be trunk (I did not see this at the time of the edit). I think at least a portion of this road SHOULD be marked as trunk (Even though it does not directly connect major population centers like the CA 41), it serves as a Other Principal Arterial that connects CA 180 with Fresno in an important spur. As such CA 180 between South De Wolf Avenue and the intersection with North Academy Avenue or that of J31 (South Reed Avenue) should be marked as Trunk.