Jessie A. Espinoza, 39, allegedly entered the southbound lanes of the interstate at 20th Street at about 7 p.m. and sideswiped a sport-utility vehicle, which swerved into a concrete barrier and rolled onto its roof, said Denver police spokesman Sonny Jackson.

Three people inside the vehicle were not seriously injured and refused help from an ambulance, he said.

Espinoza is still on the job, but not on the streets, while the incident is being investigated both criminally and by an internal process,

The results will be sent to the manager of safety, who determines what punishment, if any, is warranted. Jackson said.

Read more on the