Since 1965 Trigg Industries has supplied traffic engineering products used in traffic census and data acquisition projects. Products on our website have stood the test of time in the widest range of highway environments where average daily traffic volumes may vary from five hundred to five hundred thousand vehicles per day. Trigg products have undergone the most rigid state and field-testing regimens. We supply traffic counting accessories and road tube to manufacturers of traffic counting devices as well as hundreds of traffic engineering departments across the U.S., Canada, and to our international clients.