I was kind of surprised it takes two engineers an entire year to do this job.
If anything, it is the construction that is making the problem worse. Major shifts in traffic flow are happening every month due to different combinations of thoroughfares opening/closing/losing lanes/etc.
I'm pretty sure I saw on a news story once in the last couple of years that we have one billybob in overalls looking guy in charge of setting the timings on every single light in the city of Tulsa.
Off of the City of Tulsa's website:
Streets and Expressways
Expressways - 465 Lane Miles
Arterial Streets - 1,249 Lane Miles
Residential Streets - 3,040 Lane Miles
Central Business District - 93 Lane Miles
Signalized Intersections - 491
(includes school crossings)
I could see having three engineers only being a temporary need until the overall flow is optimized, then dropping down to two after the 6 months or year it takes to catch things up. We're pretty much going to be in widespread construction zones for the foreseeable future though.