Austin police arrested a man who they say waved a handgun at another driver while driving on Mopac Boulevard (Loop 1) in an apparent road rage incident, according to court documents.

Police charged Robert Rodriguez Guerrero, 55, with disorderly conduct/display of a firearm in a public place, a Class B misdemeanor punishable with up to 180 days in county jail, according to an arrest warrant.

The incident began Wednesday afternoon when Guerrero, driving a Toyota Camry, and the driver of a blue Chevy truck tried to change into the same lane on northbound MoPac just before the Enfield Road exit, police said. The vehicles backed off before Guerrero drove in front of the truck.

The driver of the truck told police Guerrero then pulled out a black handgun, later identified as a 40-caliber Glock 22, and pointed it at the roof of the car, “to threaten him because of the lane change.”

Guerrero, however, said he had just picked up the bag that had the handgun in it and moved it to his passenger seat “to protect himself” and denied ever removing it from the bag, according to the affidavit

Guerrero was arrested after being pulled over at the 7000 block of MoPac, the affidavit said. He was not in Travis County Jail Thursday morning, according to online jail records. His bail is set at $5,000.