First-down marker at 3rd and long

First-down marker at 3rd and long

NFL considers permanently projecting 1st-down line
Ar 130129906
The NFL is considering a laser system that would be attached to the first-down markers on both sides and would project a contrasting light green line across the field. The system would work in accord with the chain gang but is designed to provide a more accurate focal point in terms of measurements.
Ar 130129906
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