The Portland Police Bureau wants your two cents—well, if you've been in a traffic collision, pulled over or reported a crime.

Starting Sept. 10, PPB began participating in a survey conducted by researchers at the University of Illinois at Chicago to get feedback from those who have first-hand encounters with officers.

After reporting a crime, getting a ticket or having a fender-bender, you'll receive a letter from the city of Portland with a unique pin number. The survey isn't being extended to those who have been arrested recently, however.

You can then use that number to complete a survey online or over the phone. The purpose of the survey is to help PPB improve its services, a release from the bureau says. 

"This sort of survey can be invaluable and we encourage people to participate," Mayor Charlie Hales says in the release. "Anything that helps us better identify the relationships between the community and our police bureau is helpful."

No word in the release on what, if any changes, might come from the surveys.

All answers are confidential. This study is part of a long-term effort known as the National Police Research Platform.