Traffic Engineering 101

Traffic Engineering 101

citycenter

 
Greg
This is In regards to Cory,s concerns on the large number of stop sign violations at the intersection at city center.
Any Traffic Engineer will tell you, that when you have that many motorist violating a traffic control device, the odds are you have a Traffic Engineering design defect at that location, and not driver errors or poor enforcement.
In addition, even without seeing the accident records for that location, I would bet that most of the accident experiences are rear-end collisions at that stop sign.
A little advice from an old traffic engineer.  To improve traffic safety and address Cory’s concerns, the existing traffic controls should be adjusted at this intersection.  The left turn approach lane should continue to be controlled by a Stop sign, but the right turn approach lane should be changed and be controlled by a Yield sign.  ( see: Traffic Engineering 101)
Pat Nelan


to Greg, City
Kisela, Greg
Oct 7

to Pat, City
Pat:
I understand the intersection was a yield sign and changed to a stop sign after an employee was hit by a vehicle and had his leg broken.
Greg Kisela
City Manager
Sent from my iPad

Oct 7

to Greg, City
Greg
I fully understand that the normal knee-jerk reaction to that accident would have been to install the Stop sign, with the mistaken belief that somehow it would make the intersection safer.
Take another look at Cory’s video, how is the above theory working out for you?   I suggest that the same type of accident could occur today with that stop sign in place.
Moreover, there are no sidewalks, crosswalks or pedestrian crossing warning signs at the intersection. Thus, it is not surprising that a pedestrian was hit or why a pedestrian was crossing at that location.
To improve capacity, that intersection was designed to encourage a rolling stop (Yield control) for that right turn.  If you designed it for a full stop, the stem of the ‘T’ would be 90 degrees to the intersecting roadway.
Also note, that a Yield sign control, holds the same legal weight as a Stop sign control.  Motorist must stop & yield to all pedestrians and/or cross traffic.   In almost all states, traffic violation penalties are the same for both types of traffic controls
Although, you may be able to balance the city or county budgets by issuing summonses to everyone doing a rolling stop at that right turn stop sign, that is not the proper use of a traffic control device for this location.  And only serves as a entrapment for the average motorist.
Pat Nelan

Kisela, Greg
Oct 9

to Pat, City

Pat:
I have asked Community Development to have Kinley-Horn’s traffic engineer to review the City Center traffic and pedestrian flow and provide some recommendations.  I don’t disagree with you on converting the stop signs to yield but want them to also look at the mid-block pedestrian crossing to see if we can enhance the safety.
Greg Kisela
City Manager
cityCenterStop
What happened to the grass??

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