PROVIDENCE, R.I. — A self-driving shuttle got pulled over by police on its first day carrying passengers on a new Rhode Island route.

Providence Police Chief Hugh Clements said an officer pulled over the odd-looking autonomous vehicle because he had never seen one before.

“It looked like an oversize golf cart,” Clements said.

The vehicle, operated by Michigan-based May Mobility, was dropping off passengers Wednesday morning at Providence’s Olneyville Square when a police cruiser arrived with blinking lights and a siren.