This is Central City Mobility Project update #29.

I have written before about excess signals in the central city: too many traffic signals?. The fact that these exist is bad enough, but as part of the 5th Street conversion project, one-way to two-way, the city is replacing unnecessary old signals with very expensive and unnecessary new signals.

At 5th Street and S Street, a new signal is being installed. S Street is a low volume street that never needed and never should have had a traffic signal. A four-way stop sign, maybe, or maybe only stop signs for S Street. A fully signalized intersection, no way. There is nothing wrong with the existing signal for northbound traffic. Of course, a new signal is needed for southbound traffic. But the city is replacing northbound. Why?

Why is the city putting in a new signal here? Because there was one here before. If this intersection were studied for whether it needed a signal, the answer would be no. A warrant is a study indicating a need for a signal, as is simply explained at http://www.apsguide.org/chapter3_mutcd.cfm (this is much easier to read than the MUTCD). The 5th Street & S Street intersection does not meet any of these criteria. So, the city is putting in a new signal because they want to, not because it is necessary.

The current cost of a fully signalized intersection is $200K to $500K. Half a mil per. Your tax money. For intersections like 5th Street and P Street, a signal probably is necessary, particularly since the P Street and Q Street traffic sewers encourage high speeds.

It is likely that the signal at T Street is similarly unnecessary, however, T Street is busier than S Street, so might be justified by traffic volume. I’d like to see the city do a new traffic warrant study on this intersection. The city always uses warrants as an excuse for something it does not want to do, but seems to ignore these for things it wants to do. A typical traffic engineering misuse of MUTCD guidance.