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Dr Kelcie, I really enjoyed your videos thanks for sharing

Hello Kelcie. I found your presentation and particularly your data very interesting. I would like to offer another perspective on traffic flow. While the recommendation to keep one car length between you and the car ahead of you is valid, it is never followed. Why, because if you leave much more than two car lengths, in moderate to heavy traffic another car will always cut in front of you and the drivers behind you will get mad. Therefore drivers leave only enough space between them and the car ahead to prevent cars in the adjacent lane from cutting in regardless of their speed. I have personally done this while driving 80 mph and so were all the other drivers around me. The problem with this is that if there is something that causes traffic to slow down, traffic density is already at maximum so the flow must decrease. A reduced flow at maximum density necessarily means the speed must be reduced even more. And that reduced speed reduces the speed even further. This is why sometimes with smooth flowing traffic, it suddenly comes to a stop for no apparent reason.

Why change the axis of flow from X to Y (Flow vs Density & Speed vs Flow)?

is this theory similar with water flow?

excellent

really nice explanation

nice explanation i will use this for my township supervisors understanding

What are software for TIA

love this episode so much! help me realize my limitation in urban planning!

Thank you so much Dr Ralph. Currently working on a school project on traffic flow, would love to share my ideas with you.

Also, another problem with parking minimums is it's expecting private property owners to be generous with providing public parking including access. Reality is that not every private property owner is willing to provide accessible public parking including any surplus parking available. Regardless of political viewpoint, some private property owners would restrict access to parking resources and inventory information for any reason such as credentials (resident? visitor? staff? tenant? have required key fob/tag/card?), hours of operations, who they don't like/want (it can be political, legal, personal, etc.), etc. For example, some properties don't allow anyone parking on their site and then go to another property for any reason. This means anyone parking on site must patronize the property or park elsewhere. Another example is a parking lot at an apartment is only meant for residents. This means any empty spaces available can only be occupied by residents.

Thank you , could you come out a video to teach about traffic signal design ?

Thanks !

Thanks. I got it now.

Thank you so much Dr. Ralph. I had been struggling to understand these terms. You made it easier with analogies.

Your voice is like a meditation instructor. So clam and peaceful. . Nice explanation btw.

Doctor... thank hou so much for making this video. This will help me understand how flow works in my field of work.

Great points made!

How tf is this happening? Why are more and more field of US education turning into fascistic echo chambers? I hoped this would stop with genderstudies and other grievance studies, but now it's in transportation too? (Also in other STEM fields!) Is the education system teaching students or indoctrinating them to support certain ideas? Cause it sounds as if you got far too many activist professors, who badmouth alternatives and praise their favorite pet solution, even when that solution is neither perfect nor universal. And against (!) the interest of the public... in a democracy. No wonder you have CRT and race based punishment (!) creeping into US education system. The US education system seems fckd beyond belief at this point. Not sure how this will end in anything but a civil war in a few years, when students have been indoctrinated that way. Wtf are you doing, America! It's wrong and evil.

Can you share the studies?

thank you for your video. appreciate if you can recommend books circa 2020 to present.

From a maximizing throughput perspective, wouldn’t pricing all of the lanes be more effective?

thank you so very much

thank you so much

VMT should be more economically efficient as well for governments

Thank you

Very useful

excellent. thank you very much

Thanks

I felt "seen" when you were talking about targeting parents of pre teens...😉

It feels like these measuring tools and theory are designed to create sprawling cities and car dependency, while acting against alternatives like public transit and bikes.

ooohhhhh thank yoooouuuuuuu

Thank you so much

Really great

The San Francisco study was very interesting! I was wondering if you knew which one of these groups was better off at the end in terms of accessibility?

Thank you so much ma'am.

Saved for future use. Thank you! Fred, Cyclist

Very Nice Ms. Ralph!