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About Us


MDI® knows how important safety, protection, and visibility are to work zone crews and emergency responders. With this in mind, we are proud to offer our customers a wide selection of high-quality, state-of-the-art traffic control products that safeguard lives and property.

Known in the industry as a true innovator, MDI invented WindMaster®, the first spring-loaded portable sign stand, in 1975. It has been a pioneer in the utilization of vinyl retroreflective signs for highly-effective communication with motorists on the nation’s highway system. We are continually adding new safety products created by our design engineers and manufactured at our headquarters located in Farmington Hills, Michigan.

Family-owned since 1965, MDI prides itself on uncompromising products and processes, along with exceptional and proactive customer service.

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