Traffic Signal, ITS & Street Lighting Contractor *Serving Maryland and Baltimore City's Transportation needs. *Certified MBE/DBE Electrical Contractor Traffic Systems, Inc. is a family owned, certified MBE/DBE business located in Harmans, Maryland. For 18 years our mission has been to provide safe, quality projects to our customers. We accomplish our goals every Year, but we are always striving to improve our business by providing high-quality services.