A Tesla Model Y with autopilot engaged has collided with a parked Michigan state police car, officers said on Twitter.

The Tesla occupant was issued citations for failure to give way and driving with a suspended license, according to Michigan police.

The collision happened as officers were investigating another collision - between a car and a deer. There were no injuries.

The police Dodge Charger was damaged. There were no reports on the Tesla.

In Detroit Monday a Tesla collided with a tractor-trailer.

According to The Associated Press, police in Detroit were unable to determine if the driver was using Tesla's autopilot or "full self-driving" software. The National Highway Traffic Safety Administration is investigating.

Tesla's autopilot system automatically brakes, accelerates and steers vehicles. The electric vehicle maker sells its full self-driving software as a $10,000 one-time add-on and plans to launch it as a subscription model this summer. The autonomous driving vehicles can park, change lanes and recognize stop signs and traffic lights.

Although Tesla's autopilot technology has improved it has been the subject of regulatory scrutiny since 2016 when an owner died while driving his Tesla Model S with Autopilot in Gainesville, Florida. 

In 2019 a 50-year-old Lake Worth, Florida, man died when his Model 3 on Autopilot collided with a semitractor-trailer.

The National Transportation Safety Board has called for clear regulations for autonomous driving software last month and said Tesla was testing technologies with "limited oversight or reporting requirements."