Are traffic infractions criminal? Violating some traffic laws can be a misdemeanor or felony while most are infractions. I don’t know if infraction is considered “criminal”.
This is often actually an area where toubwill find conflicting info; public info provided by the California state courts says yes, they are, in California [0], while you will find other sources, including law offices, saying they aren’t. [1]
The issue is largely that they are structured as crimes in state law, but the manner of punishment available does not make them “crimes” within the purview of federal Constitutional protections, or federal statutory consequences for conviction of state crimes (e.g., in the immigration system.)
Since you're too busy to do basic research to answer your own curiosity, of course I'll let you know that speeding is a misdemeanor in Alabama, Arkansas, Delaware, Georgia, Iowa, Louisiana, Maryland, Mississippi, Montana, Nevada, Ohio, Oklahoma, South Carolina, Tennessee, Texas, West Virginia, Wyoming. I'm sure I'm missing a few.