i -Way or the highway

The US Department of Transportation has granted the construction of digital billboards along Interstate and federal-aid highways protection under the Highway Beautification Act. Changeable electronic variable message signs, or CEVMS, generally take the form of large LED displays that function like giant TV screens and show advertisements that change every four, six or eight seconds. These signs must meet Federal/State Agreement (FSA) requirements for the particular state and further restrictive measures for constructing signs are still under state discretion.

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