
Most road projects have subcontractors do the specialized work (Tends to be Gerstner Electric here (St Louis)).
The signal supplier will still have to meet the jurisdiction's requirements.
Some jurisdictions have a "We want this only" view (MoDOT uses exclusively Durasig heads & MTS Ped heads)
MoDOT is currently doing whole intersection upgrades where they change out all the heads at once (sometimes its just yellow Durasigs to black Durasigs).
