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Recent content by teeman

  1. teeman

    Technical drawing reviewing too time consuming?

    Designers do not always understand what they are designing. Drawings go to drafters, who do not always understand what they are drawing. Plans go to Contractors, who may or may not recognize a error. There is a current class of managers who think that schedule and budget are more important than...
  2. teeman

    Engineering Firm vs Government Position

    After graduation, I was interviewed by a number of private firms and eventually hired by a government agency that was expanding its construction program. I had wanted to do structural work, but was hired into a different discipline. When I said I did not have experience in that discipline, I was...
  3. teeman

    Traffic Signal Timing - Left Turn Loop

    Not clear on the loop layout. Classic volume density relies on advance detection and not stopline loops. Regardless of the configuration, the following should hold. Since the loop is in not in an exclusive turn lane, it can't tell if the waiting cars want to go through or left. The 3s delay...
  4. teeman

    Analizing a signalized intersection with shared (thru/left thru/right) lanes.

    Synchro is a mathematical model. In most instances it provides a reasonable approximation of operations. Sometimes the analysis bears no resemblance to what is occurring in the real world. If the model is not accurate you have to make adjustments to the inputs. In this case it may be the...
  5. teeman

    Adjusting manual turning counts with seasonal factors?

    In general I would consider a December count to represent something less than average conditions, but it depends on the location. For a site associated with commercial shopping areas a December count may represent a higher than average tally. Failure at opening is a cause for concern and the...
  6. teeman

    Two-Way Left-Turn Lanes (TWLTL)

    I would consider extending the center lane lines to the edge of sidestreet to maximize storage and convert the center lane to back-to-back left turn lanes for this section. Minimal storage for the sidestreet and remaining pavement for the truck entrance.
  7. teeman

    Synchro vs VISSIM

    Synchro is a mathematical model that approximates intersection operations and calculates delays and queues from a limited number of input values. The results are reasonably accurate for most conditions being analyzed. If the SimTraffic simulation associated with Sychro is run for a long enough...
  8. teeman

    Barnes Dance (Pedestrian Scramble Phase) warrants?

    I have never seen a "Warrant" for an exclusive pedestrian phase. Most discussion in the traffic literature has been general in nature with phrases such as "heavy" pedestrian traffic often present. Pages 196-197 of the Signalized Intersections: Imformational Guide has a decent discussion of the...
  9. teeman

    would you reject this sign?

    The difference between the supplied truck graphic and that shown in the Standard Sign book is minor and does not interfere with the intended message. I would not call for replacement, but would notify the Contractor that any signs supplied in the future should not differ from those in the...
  10. teeman

    Traffic Engineers: Please help me decide

    If you are interested in traffic engineering you shoulf pursue that interest until it no longer works for you. Traffic is usually more interesting than the other transportation fields and a knowledge of traffic engineering will make you a better (and more marketable) transportation engineer. I...
  11. teeman

    Design of a signal sequence chart

    I would contact the reviewing agency and request a sample drawing showing the plan layout they would prefer.
  12. teeman

    Design of a signal sequence chart

    Most signal plans will have a Phase Timing Chart showing the values to be set in the controller for the phase intervals utilized (minimum, extension, max, yellow,all red, etc.). The chart also shows the signal head display (G,Y,R)associated with each phase interval. The purpose of the Phase...
  13. teeman

    Crosswalks, stop bars at driveways?

    In general you only need to define which road has the right of way at an intersection, the junction of two roadways at grade. State Motor Vehicle Codes usually require driveway traffic to yield to all traffic including sidewalk traffic, making the stop sign unnecessary. Where the commercial...
  14. teeman

    Roundabout Software

    I am very comfortable in using Synchro for analyzing signalized networks. I find it to be very reliable for that purpose. I am not familiar with the methodology Synchro utilizes to evaluate roundabout operations, so I am less likely to use it for that purpose. From what I understand, each of...
  15. teeman

    Traffic Signal Coordination

    Synchro will develop a coordination plan that minimizes delay in the corridor. How good it is depends on the work you put into the network or corridor you build. Synchro allows you to group adjacent signals together or break them into separate groups of signals. You need to be aware not all...
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