btrettel

77 ms·

721.
by btrettel 7y ago
Theoretical fluid dynamicist here. I'm fairly decent with math, or at least solving differential equations. Related to the essay, I've always found it odd how many people with a CS background tend to "compute first, ask quest
722.
by btrettel 7y ago
Might depend on the location. I've seen more red light runners in the half decade I've lived in Austin than the remainder of my life. Another possibility is that I might be paying more attention to the problem now than before.
723.
by btrettel 7y ago
San Jacinto Blvd. at the University of Texas at Austin campus. I would intentionally ride there on my commute because the speed limit is so low. To be fair, few drivers seem to actually go 40 mph, though 25-30 mph seems to be regularly obse
724.
by btrettel 7y ago
> The other way would be to ignore the bike lane and ride in the center of the lane that you would use if you were driving a car through there. This is what I do for the most part, and I'd say very roughly 20% of cyclists do the sam
725.
by btrettel 7y ago
You also might find the acronym MGIF (must get in front) to be interesting. I think it's mostly used by British cyclists. If my memory serves, the responses range wildly. On one end you have completely reasonable and sincere sounding a
726.
by btrettel 7y ago
> What's "protected" about a bike lane that crosses freeway onramps? I think you're talking about something completely different from what some other people in this discussion are calling "protected" lanes.
727.
by btrettel 7y ago
> Also, are pedestrians walking into bike lanes a valid reason not to use bike lanes? Depends on the location. Some places have high concentrations of bad pedestrians. In Austin there's one bike lane in particular where cyclists nee
728.
by btrettel 7y ago
Yes, those are often called "punishment passes". I've even had drivers pass me dangerously closely when I was riding 17 mph in a 15 mph zone with sharrows printed in the lane. I stop and speak with some of these drivers at th
729.
by btrettel 7y ago
> There is an anti-car/pro-bike lane group of researchers who want to push this style of road design super hard right now at all costs. I agree with this, at least for activists as I don't have much experience with researchers.
730.
by btrettel 7y ago
> When the light turned green he took forever to get going and even after 20 seconds he was still going dangerously slow so I honked him and felt like a jerk. I did not understand why he simply didn't use the bike lane. Cyclist here
731.
by btrettel 7y ago
> Protected cycle lanes are great only so long as nobody turns to the right directly in front of you. Yes, many bike lane advocates seem to think bike lanes are some panacea, but the vast majority of them don't address this basic is
732.
by btrettel 7y ago
Random LaTeX question: Does anyone have any tips for writing LaTeX code to avoid typos or other mistakes? I.e., using the fact that LaTeX is a programming language and not just markup language to catch mistakes? I started adding what basica
733.
by btrettel 7y ago
This hasn't been my experience. I've asked questions that in retrospect were fairly stupid and I've only been treated with respect.
734.
by btrettel 7y ago
Sorry, I was unclear. I agree that the demo does what it intended to do. I was just listing a few additional reasons to believe it may not be physically accurate as-is. I know from previous discussions on HN that many readers are interested
735.
by btrettel 7y ago
Yes, I've found that computer graphics focused fluid simulations frequently choose stability over physical accuracy. These choices also result in unphysically high numerical viscosity. (I didn't check what finite difference stenci
736.
by btrettel 7y ago
If you're comfortable with giving details, I'd recommend posting a comment at PubPeer on the paper. https://pubpeer.com/ Plagiarism like that is far too common. Every paper a plagiarist gets away with helps their
737.
by btrettel 7y ago
> In the scientific world, he says, it may be risky if researchers actively choose to study trendy topics that hit the headlines, but aren’t as important as other pressing issues that demand more time and effort. I think scientific resea
738.
by btrettel 7y ago
To be honest, I'd buy a transponder if it meant self-driving cars couldn't hit me as a cyclist. I'd strongly oppose transponder requirements and cycling bans. My impression from self-driving car advocates is that they are oka
739.
by btrettel 7y ago
> The average car utilization is less than 4.5%. For over 95% of the time, most cars are just sitting there doing nothing. This is roughly true of bikes as well, but I've never seen it used as an argument against cycling. There is o
740.
by btrettel 7y ago
Once when I was visiting a technical library, I saw that they had many volumes of a particular 1940s Russian engineering journal (Izvestiia Akademii nauk SSSR, Otdelenie tekhnicheskikh nauk, rare in the US, probably common in Russian) that
741.
by btrettel 7y ago
I'm a cyclist. This study might explain the sheer number of drivers who tell me that they passed me dangerously because I gave them "no choice". When stopped at stoplights, I've told some of these drivers that they alway
742.
by btrettel 8y ago
Thanks. Working from there, this website list many state health care price laws in a PDF: https://www.pcpcc.org/resource/report-card-state-price-trans... This is just what I could find quickly. There might be better re
743.
by btrettel 8y ago
Which states specifically have these laws? What's the typical legal name for these laws? Couldn't find anything on this in a few quick Google searches.
744.
by btrettel 8y ago
Additionally, I want to emphasize that it's important to not write off a non-drinking friend simply because they don't seem to be opening up in the way you want. I find at least some drinkers seem to write me off in all social sit
745.
by btrettel 8y ago
Thanks, I think a lack of vulnerability is a useful perspective to understand some of what I've experienced. Typically the people who seem concerned that I'm not drinking don't know me well.
746.
by btrettel 8y ago
Yes, I'm often asked about why too. I used to be bothered by this because (like you) I'd find that people often don't accept my answers. Right now I don't give a clear answer (e.g. Q: "Why don't you drink?&quot
747.
by btrettel 8y ago
> its because you're showing you're not. Grab a sprite and say it's a G&T and enjoy yourself. So the way to look like I'm enjoying myself is to fake drinking? At first I thought you might be suggesting that I look
748.
by btrettel 8y ago
As a lifelong teetotaler, one thing I've consistently found strange is how much other people seem concerned by me not drinking at social events. This seems consistent with the conclusions of the study. Some people want to make sure tha
749.
by btrettel 8y ago
Perhaps we've misunderstood each other. The impression I got from your post was that you believe harming or killing cyclists is acceptable if you perceive that they are breaking the law (regardless of whether the cyclist is actually br
750.
by btrettel 8y ago
Running a stop sign or traffic light should not be a death sentence. Plus, there have been many times when I've been on the receiving end of dangerous "punishment passes" from drivers who believe I'm doing something ille

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