Work Zone Advance Warning Sign Spacing (MUTCD 6C-1)
The signs ahead of the taper traffic-taper-length never placed. MUTCD Table 6C-1 verbatim (a public-domain federal work): urban low 100/100/100, urban high 350/350/350, rural 500/500/500, expressway 1,000/1,500/2,640 ft. Reported as distances UPSTREAM of the transition, because the series reads backward from how it is signed - the third sign is the first a driver sees, so a rural three-sign series opens 1,500 ft ahead of the taper. Adds the 8-12x speed-limit placement check and the 1,500-ft open-highway guidance.
Formula and source
Table 6C-1 A/B/C spacings by road type: urban low 100/100/100, urban high 350/350/350, rural 500/500/500, expressway 1,000/1,500/2,640 ft; sign positions upstream of the transition = A, A+B, A+B+C.
MUTCD Table 6C-1, Suggested Advance Warning Sign Spacing, from the FHWA Manual on Uniform Traffic Control Devices - a US-government public-domain work, extracted from the FHWA PDF rather than a secondary summary.
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