PITTSBURGH — Companies testing autonomous vehicles in Pittsburgh will have to immediately report crashes resulting in any injuries as part of new guidelines announced Monday intended to boost public confidence in the testing after a deadly accident in Arizona last year.

Karina Ricks, director of the city’s Department of Mobility and Infrastructure, said the city was working on guidelines before the March 18 accident in Tempe when one of Uber’s autonomous test vehicles hit and killed a pedestrian as she crossed a dark road outside the lines of a crosswalk.

“The Tempe incident raised the urgency for the guidelines,” Ricks said.

The Pittsburgh guidelines were included in an executive order signed by Mayor Bill Peduto on Monday.

“We don’t want that situation to happen again,” said Raj Rajkumar, professor and co-director of the General Motors-Carnegie Mellon Vehicular Information Technology Collaborative Research Lab. Another accident would cause “a social backlash,” he said, adding that he hopes guidelines such as those adopted by Pittsburgh and the testing companies will help alleviate public concerns.

“This indicates that the city wants the technology to develop, to evolve, to measure, and they want to work with the companies and the university where the technology was born,” he said.

Representatives of the five entities testing autonomous vehicles in Pittsburgh — Aptiv, Argo AI, Aurora Innovation, Carnegie Mellon University, and Uber — expressed their support for Peduto’s measure.

Under the guidelines, companies have three days to report crashes resulting in any damage.

The companies will have to submit reports twice a year to the city, which will then issue summary reports to the public, Ricks said.