Speed / Density / Flow Relationships | NCEES Civil Engineering PE Exam [Section 5.1.1.4; 5.1.2]

[@hectorarmandofigueroaurrea8870]

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!

[@FindleyDaniel]

That's very kind, thank you! I'm glad these are useful.

[@leonardoz.wongbae9165]

@@FindleyDaniel, what is the title of your book?

[@FindleyDaniel]

@@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

[@oleopathic]

explained incredibly well. better than my transpo grad professor did!

[@FindleyDaniel]

Thanks for the kind words, I appreciate the feedback!

[@samirabakli6096]

Very helpful explanation for all density, flow and speed relations and related formulas on PE-Civil manual.

[@oleopathic]

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 some outdated vids on yt still refer to the "bible" cerm which atm is heavily obsolete.

[@m.imvvvv]

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

[@carolinamendez1053]

Dr. Findley, based on the graphs qcap is also qmax?.. why can we not use qcap and qmax equations interchangeably?

[@FindleyDaniel]

Yes, they are the same - I just tried to keep the same terminology as the NCEES equations, but they represent the same value.

[@oleopathic]

are more fundamental transpo videos coming along with example problems ? thanks.

[@FindleyDaniel]

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

[@carolinamendez1053]

Equation from the handbook for q max = Kf X Uf / 4. ---- is there a reason why the 4 is not included??? Thank you

[@FindleyDaniel]

Are you referring to the equation at 11:43?

[@ezpeezee5368]

can u give me the formula of free flow speed(uf) if its not given in the problem ?

[@FindleyDaniel]

Yes, you can use the equation at 7:48 to solve for uf.

[@Radenardin]

Excuse me. May I know about the references you used? Thank you.

[@FindleyDaniel]

Yes, it's from the NCEES civil reference handbook: help.ncees.org/article/87-ncees-exam-reference-handbooks

[@Abcdefg123.97]

Amazing lecture, thank you 👍

[@muhammadzaidhasan1426]

can a speed density graph be parabolic?

[@FindleyDaniel]

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.

[@monseigneur6365]

It really useful

[@FindleyDaniel]

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: kzbin.info/aero/PLQ2tBMRKXROYAW4OnuL0GjVgfdrtBp9Pp

[@oleopathic]

ncees hb 1.1, pages 265, 266, 267.