Category Archives for "Design"

Diverging Diamond Interchange Primer

By Mike Spack, PE, PTOE Motorists drive through the Diverging Diamond Interchanges (DDI) on the left side of the road, which converts all turns into reduced conflict curbside turns.  Curbside left turns result in more capacity and better safety performance at locations with heavy traffic compared to traditional diamond interchanges.  This post provides background, benefits, […]

Designing for All Modes of Travel

By Mike Spack, PE, PTOE I attended a North Central Section of the Institute of Transportation Engineers section meeting in 2009.  It was a panel discussion on “Complete Streets.”  The general idea is to balance service to private vehicles, transit users, bicycles, and pedestrians through the design of our transportation systems. Traditionally, vehicles have been […]

School Speed Zones

By Bryant Ficek, PE, PTOE For a city traffic engineer, nothing signifies the end of summer quite like the barrage of calls from concerned parents (and sometimes school officials) requesting school speed zones and safety improvements. With so much at stake and so many factors to consider, school speed zones can easily become one of […]

Control Devices: Stop Signs Benefits, Limitations and Design Guidelines

By Mike Spack, PE, PTOE Stop signs are the cheapest traffic control devices for controlling traffic at an intersection. This post provides background, benefits, limitations, design guidelines, and further resources for designing stop sign installations. Background The Manual on Uniform Traffic Control Devices (jargon: MUTCD) governs the use of all traffic control devices in the […]

Pros & Cons of Back-In Angle Parking

By Bryant Ficek, PE, PTOE Back-in angle parking is a relatively new concept starting to be seen in more areas. The basic concept is similar to standard 45-degree parking. But instead of pulling forward into the space, drivers back into the angled stall. This is also referred to as reverse-angle or reverse diagonal parking. For […]

Reduced Conflict Intersections in Action

Mike Spack, PE, PTOE Thanks to Denny Eyler, from SRF Consulting, for the following comments related to our Reduced Conflict Intersections post. Denny has significant experience with these types of intersections and we had a good email exchange over them. I think you’ll find his thoughts helpful and think they are worth a post instead […]

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