Learning to Love Your Traffic Engineer ? Standards

Wednesday, December 11 by JerryFoster

Using Desired Operating SpeedTo learn to love our traffic engineers, we have to understand why they don?t feel they have the authority to design roads to meet citizens? needs ? the standards won?t let them.

Marohn notes that standards are ?the engineering profession’s version of defensive medicine.?

Gary Toth invites us to ?marvel at how thoroughly the transportation establishment delivered on its perceived mandate?, including ??language/terminology; funding mechanisms; curriculum at universities; values; and policies. Common professional organizations? reinforce and standardize this? at a scale that has rarely been matched by any other profession.?

Citizens should note that engineers are required to follow the standards for traffic signals (Manual for Uniform Traffic Control Devices) – the others are guidelines.

Toth advises ?Design manuals often present standards in ranges from minimum to desirable. Has the designer selected the desirables instead of minimums?? Residents will want the minimums, as the ?desirables? are from the point of view of creating a wider, straighter and faster roadway.

Conventional DesignIn this series, we?ve set up a ?straw man? based on traditional engineering practices. The critique reported here comes from within the profession, however, and context sensitive standards such as NJDOT?s Smart Transportation Guidebook have been published that, if implemented, will significantly improve livability, which is the goal of the WWBPA.

We?ve seen how standards? flexibility enable engineers to design bike and walk friendly roadways, so in our next installment, we?ll look at liability concerns.

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