From the summaries I’ve seen, AB5 provides a new temporary exemption (through 2022) for construction truckers from the ABC test that did not exist under the Dynamex ruling, but not for truckers generally.

>and the other specifically exempts truckers

Are you talking about AB 5? Because if so, it's nowhere near that simple.

"The U.S. District Court for the Southern District of California, after hearing the case, issued a preliminary injunction blocking the state from enforcing AB5 .....The court noted that carriers likely would have to reclassify all independent-contractor drivers as employees for all purposes to comply with the California labor law.... California officials and the International Brotherhood of Teamsters appealed the ruling to the 9th Circuit. The appeals court reversed the district court's order...."

I'm not a lawyer, but to a layman it looks like a legal fustercluck.

https://www.shrm.org/resourcesandtools/legal-and-compliance/...