Speed / Density / Flow Relationships | NCEES Civil Engineering PE Exam [Section 5.1.1.4; 5.1.2]
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- Опубликовано: 30 сен 2024
- Traffic Flow Theory Relationships of the assumed basic traffic flow theory relationships between traffic speed (space mean speed; also referred to as “u”), flow (also referred to as “q”), and density (also referred to as “k”).
National Council of Examiners for Engineering and Surveying
Civil Engineering Principles and Practice of Engineering (PE) Exam
2021 v1.0 Reference Handbook
For more information about ITRE NC State Civil Engineering PE Exam Review Courses: itre.ncsu.edu/...
#DanielFindley #TransportationEngineering #NCEESCivilEngineering
I want more videos like this because you use same method which the director use, if we do it in diffrenet way we will get zero
explained incredibly well. better than my transpo grad professor did!
Thanks for the kind words, I appreciate the feedback!
Doctor Findley, I really appreciate your effort to spread the knowledge of traffic engineering, your book is one of the best I have ever used; every day you learn something new. greetings from Mexico!
That's very kind, thank you! I'm glad these are useful.
@@FindleyDaniel, what is the title of your book?
@@leonardoz.wongbae9165 It's Highway Engineering: Planning, Design, and Operations
Second Edition • 2022
www.sciencedirect.com/book/9780128221853/highway-engineering
www.amazon.com/Highway-Engineering-Planning-Design-Operations/dp/0128221852
are more fundamental transpo videos coming along with example problems ? thanks.
Yes, I'm regularly adding videos and example problems. If it helps, here's another way I've organized the playlists: sites.google.com/ncsu.edu/daniel-findley/educational-resources
Very helpful explanation for all density, flow and speed relations and related formulas on PE-Civil manual.
Dr. Findley, based on the graphs qcap is also qmax?.. why can we not use qcap and qmax equations interchangeably?
Yes, they are the same - I just tried to keep the same terminology as the NCEES equations, but they represent the same value.
can u give me the formula of free flow speed(uf) if its not given in the problem ?
Yes, you can use the equation at 7:48 to solve for uf.
Equation from the handbook for q max = Kf X Uf / 4. ---- is there a reason why the 4 is not included??? Thank you
Are you referring to the equation at 11:43?
Excuse me. May I know about the references you used? Thank you.
Yes, it's from the NCEES civil reference handbook: help.ncees.org/article/87-ncees-exam-reference-handbooks
It really useful
You're welcome! In case you're looking for more videos like this, here is a link to a set of playlists I've organized:
sites.google.com/ncsu.edu/daniel-findley/educational-resources
Specifically, here's a playlist with more NCEES topics: ruclips.net/p/PLQ2tBMRKXROYAW4OnuL0GjVgfdrtBp9Pp
can a speed density graph be parabolic?
I can't think of a scenario where that would be the case (without a lurking variable) and it would result in drastically different results than the linear relationship assumed by Greenshields.
Amazing lecture, thank you 👍
i love how this and other vids respect and follow the ncees hb 1.1. very helpful for those of us who are taking the new cbt civil pe exam. some outdated vids on yt still refer to the "bible" cerm which atm is heavily obsolete.
ncees hb 1.1, pages 265, 266, 267.