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  • Users: TEEI
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  1. TEEI

    Turn lane length reduction

    145' includes a 50' taper. It is a standard. 110' includes a 50' taper 50' storage is based on intersection analysis (95th percentile back of queue) This is an existing turn lane There is no posted speed limit, so we were requested to use 25 mph as posted speed. AADT=2000 VPD
  2. TEEI

    Turn lane length reduction

    Here is the situation. Posted Speed = 25 mph Design Speed = 25 mph + 5 mph = 30 mph Min. Deceleration length (based on local agency manual for 35 mph Design Speed)= 145' Queue Length = 50 feet Total right turn lane length = 145'+ 50' = 195' Available length = 110'due to constraints. Difference =...
  3. TEEI

    Benefit Cost Ratio

    I have 3 improvement alternatives for an intersection improvement project. Using the delay and crash history how do we determine the benefit cost ratio for these 3 alternatives?
  4. TEEI

    Traffic Signal Coordination

    I am currently working on traffic signal coordination project with 7 signalized intersections along a two-way roadway. Also, there are heavy left-turns along this corridor with exclusive pedestrian phases at 3 intersections. Can anybody explain me on how to achieve optimum green-band in both...
  5. TEEI

    v/c ratio versus Lane Utilization Factor.

    Can anybody explain me the relation between v/c ratio and Lane utilization Factor? I was told that for v/c ratios greater than 0.9, lane utilization factors can be changed to 1.0. Is this correct? If yes, can anybody give me the source and documentation for this? Thanks
  6. TEEI

    Origin and Destination Study

    Can anybody explain me the procedure to conduct an Origin and Destination Study in a Downtown district? Thanks
  7. TEEI

    Parking Lot Design - Incline

    Generally 4% is considered to be steep. But I have seen 6%-8% in the most rare situations.
  8. TEEI

    Controlled and Limited Access Facilities

    Can anybody tell me the difference between a controlled access facility and a limited access facility?
  9. TEEI

    Two-way left turn lanes

    I have to do a capacity on a two-lane undivided roadway with a suicide(two-way left turn lane) lane in the middle. Do we have to account for this lane in the capacity analysis or do we have to just consider the roadway segment as a two-lane undivided? Please throw some light on this...
  10. TEEI

    Site Development Traffic Studies

    One good book i could think of is Transportation and Land Development 2nd Edition Author(s):Vergil G.Stover Frank J.Koepke This book is available through ITE website. Good Luck.. TEEI
  11. TEEI

    Mid Block-Crosswalk Inroad Lighting

    I have a problem in justifying a Midblock-Crosswalk for a school building. MUTCD requires one to do a engineering study while putting in a midblock crosswalk. What actually does the engineering study means in this regard? Does anyone ever worked on in-road lighting? Does this require any...
  12. TEEI

    Traffic Signal Design Courses

    Does anyone know if there is a good Traffic Signal Design(Signal Timing, Conduit installation, Detectors, controllers, mast arm installation) Course available anywhere in US
  13. TEEI

    85th Percentile Speed

    What is the importance of 85th Percentile Speed?

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