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California Senate approves ban on autonomous trucks
(driveteslacanada.ca)
This is a most excellent place for technology news and articles.
Teamsters have a freight division but the total teamster membership was 1.3 in 2015 and there were 3.6 million truckers in the United States in 2020, so I wouldn’t say most truckers are in a union.
Teamsters doesn’t disclose what percent of their membership is made up by their freight division
Don't forget that the package division(ups) is a large chunk of their membership.
According to their website "The Package Division is the union’s largest division, serving hundreds of thousands of members throughout North America."