The department handles all matters related to traffic in Mainz. It orders traffic signs, oversees their installation, and ensures traffic flows safely. It also issues resident parking permits and parking accommodations for people with severe disabilities. It approves and provides security for events held on public streets—from neighborhood street festivals to the Rose Monday parade.

According to the departmental organizational chart, this department falls under Department V: Environment and Mobility. For technical reasons, however, you will find all information under Department VIII: Construction, Historic Preservation, and Historical Heritage.