Autonomous delivery truck startup Gatik on Thursday said it will be putting its box trucks on the road in Kansas after state officials gave it and its partner and customer Walmart Inc (WMT.N) the go-ahead.

Kansas Governor Laura Kelly on Friday signed into law a bill permitting use of driverless vehicles in the state without a human safety driver behind the wheel…

The Teamsters union, a trial lawyers and a Kansas workers’ group had opposed the bill, citing issues such as insurance and liability requirements.

The Teamsters in a statement said the bill was rushed through, and that it allowed autonomous vehicles to operate “recklessly, risking the lives of our friends and neighbors, and upending the workforce as we know it.”