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  1. ACtrafficengr

    Does IBC cover fences?

    I've been asked about fall protection fencing for a bridge over a dam spillway. It's on a filled masonry arch, so posts will be driven into the4 ground. It's in a historic area, so aesthetics are a concern. I'm used to highway design standards, which don't really apply here. As I understand...
  2. ACtrafficengr

    A parent's question re: ChemE & CompSci

    If this is the wrong spot for this question, just say so and I'll move it. I asked my 16-year old yesterday about what he would like to study in college, and he said chemistry or comp sci. I asked if he had a preference between chemistry as a science or chemical engineering. He apparently...
  3. ACtrafficengr

    U.S. Accessibility Guidelines for Pedestrian Facilities in the Public Right-of-Way

    I think it's been at least a decade since this rule was proposed. I was starting to wonder if it ever would be adopted. The draft manual has been treated as best practice for a while, but now it's enforceable. One thing to watch for is the maximum cross slope for walkways is 2.00%, not the...
  4. ACtrafficengr

    Fatal wall collapse during restoration after engineer says demo it

    Engineers Warned Landmarks Commission Salvaging a Synagogue Would Be Dangerous. Then a Worker Got Crushed to Death. "the general counsel for the landmarks commission had “instructed” him not to again bring up his recommendation for a full demolition so as not to “offend” the commissioners who...
  5. ACtrafficengr

    Adaptive reuse of abandoned oil and gas wells

    Pardon me if this has already been discussed, but I think this is interesting. In addition to providing cooling and heating, it could employ former roughnecks, and recover some value from what are basically stranded assets. On the other hand, I'm not sure it has potential to be a major player...
  6. ACtrafficengr

    New building near existing culvert

    I'm reviewing a concept site plan for a new retail building. A drainage easement extends over 400 feet into through the site that contains a large CNP culvert conveying a creek. The pipe invert is about 25 ft below the surface. Concept plans show a proposed building about 20 ft from the...
  7. ACtrafficengr

    Vehicle restriction signs

    We have an intersection where large vehicles are off-tracking into a dry-laid stone wall on one corner. I'm getting pressure to come up with a restriction to prevent it. The MUTCD mostly has truck weight restriction signs, and I need something to prohibit longer vehicles that can't make the...
  8. ACtrafficengr

    hand mix CLSM leveling course?

    A friend is building a pole barn on a primitive site. He's having a hard time finding someone that will deliver a short load for footings to his site. Frost depth is 4 feet/1.2 m. Could he overescavate a bit, place some CLSM as a leveling course and place precast footings on that? That was...
  9. ACtrafficengr

    US MUTCD Update in the works

    This could have gone in the Traffic forum, but I thought it would have more visibility here. The Federal Highways Administration is currently asking for comments on proposed changes to the Manual on Uniform Traffic Control Devices. On the MUTCD website, you can watch recordings of three...
  10. ACtrafficengr

    definition of "engineering failure"

    I was going to post this on the Sisters Creek walkway thread, but thought it might be worth it's own discussion. Does engineering failure only include a design or construction error that directly leads to structural failure, fire, short circuit, or other failure, or does it include designs that...
  11. ACtrafficengr

    Tesla touch screen contributes to crash, license suspension.

    Any reader of Norman's The Design of Everyday Things or Chiles' Inviting Disaster knows that operator error is often a result of design error. This sounds like a case in point. A German driver was attempting to adjust his wipers with the touchscreen and drove off the road into some trees. The...
  12. ACtrafficengr

    Traffic sign inventory services and asset management system

    I'm writing an RFP for obtaining consultant services to inventory our traffic signs and provide a software package for their management. Would anyone be willing to share lessons learned in similar projects, or sample RFPs I could draw from? This is in the US, so the management system would have...
  13. ACtrafficengr

    Fabric structure purchase and installation

    I've been asked to come up with a specification for fabric-covered structures to replace two old salt domes. Would anyone be willing to share their specifications or experiences with these? Also, could a typical public works crew assemble these structures, or should the supplier do it? I'm...
  14. ACtrafficengr

    RoadEng highway design software

    Does anyone have experience with this software? Their promotional materials make it look really good for alignments, earthwork, culverts, and so forth, but they don't get into other road elements such as traffic control devices, guide rail, erosion control, storm water management, utilities...
  15. ACtrafficengr

    Bobcat punches through ped overpass deck, lands on van

    Apparently it wasn't designed for vehicle loads. I thought it was common practice to design them for H-10 loads for maintenance vehicles and ambulances. Link Map view My glass has a v/c ratio of 0.5 Maybe the tyranny of Murphy is the penalty for hubris. - http://xkcd.com/319/
  16. ACtrafficengr

    Footings above frost depth? Really?

    I have a mason telling me that 2 1/2 feet (0.75m)4 is deep enough for for footings supporting an enclosed porch. Frost depth is ~4 ft(1.2m) in our area. The soil appears to be silty sand, well above the water table. The porch open underneath and supported by masonry columns, not on an enclosed...
  17. ACtrafficengr

    Street lighting costs

    I'm looking for planning-level estimates of lifecycle costs per mile for streetlights. This is for a benefit/cost analysis. Anything useful would be appreciated. My glass has a v/c ratio of 0.5 Maybe the tyranny of Murphy is the penalty for hubris. - http://xkcd.com/319/
  18. ACtrafficengr

    Traffic study contents

    Excuse me while I rant a bit. It's rare for a traffic study to cover more than trip generation and capacity considerations. If traffic safety is mentioned, it's almost an afterthought. I get it. The Highway Capacity Manual has been around for decades, and is a mature practice. We're used to...
  19. ACtrafficengr

    APOGDOHS and "Little Green Book?"

    Has anyone heard anything about when the next versions of the Green Book (A Policy on Geometric Design of Highways and Streets) and "Little Green Book" (Guidelines for Geometric Design of Very Low-Volume Local Roads (ADT ≤ 400)) will be released? I'm just trying to figure out if we should put...
  20. ACtrafficengr

    NCUTCD asking for comments on speed limits

    They are asking practitioners to fill out a short survey on the subject.

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