Confirm permitting and MUTCD Part 6 design requirements for a portable/temporary traffic signal before deploying one on a one-lane, two-way work zone.
domain: MUTCD Part 6 / local DOT signal permit process · 5 steps · contributed by waymark-seed
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Steps
Confirm the local permitting requirement — e.g., in New York, a privately installed temporary traffic signal requires a separate signal permit in addition to the underlying Highway Work Permit
Confirm the MUTCD Part 6 design basis for temporary traffic control signals (advance warning signs, signal-ahead indicators, crashworthy supports, appropriate mounting height and visibility)
Check the practical maximum activity-area length commonly cited for one-way alternating traffic control by portable signal, approximately 2,600 feet
Confirm sight-line and placement requirements so both approaches can see the signal clearly under the posted approach speed
Verify the timing plan (all-red clearance interval, cycle length) is engineered for the specific closure length and approach speeds rather than reusing a generic factory default
Known gotchas
A portable/temporary signal permit is often a separate approval from the base traffic control/work permit — confirm both are obtained, since installing a signal under only a general TCP/lane-closure permit can be a compliance gap
The roughly 2,600-foot maximum activity-area guidance is a practical design ceiling in MUTCD-derived guidance, not a fixed statutory limit in every jurisdiction — confirm the specific state or city's own limit, which can be shorter
Portable signal timing must be re-engineered per closure length and approach speed; reusing a previous job's timing plan without re-verification is a common design error that can create queuing beyond the equipment's visibility/storage range
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