Hacker Newsnew | past | comments | ask | show | jobs | submit | smcin's commentslogin

How much formal math background is required? Undergrad/graduate/PhD/...? For one person on each team or everyone?

Doesn't their own Île-de-France Mobilités app have reliable information on outages? Surely it's more reliable than their Twitter account?

It's the one I use the most, but in my experience it's lagging behind the Twitter accounts. It's also noisy because it puts last-minute outages at the same level as minor month-long schedule change (which can't be dismissed), so some lines (eg. line R) are almost always displayed as having issues.

Ok thanks for the explanation.

For me a website is much more accessible than a phone app in many situations.

Ok but can you answer my question about reliability?

I don't have a horse in this race but I would question the idea that a municipal service has a better reliability record than x/twitter.

But who is publishing the outage information to X/Twitter if not the utility itself? I'd be surprised if they do that more timely and reliably on a third-party platform than their own app. That's not the case for any European or US transit authorities I know.

Can any other user of public transport in Paris comment?


The information may be as reliable, but:

1. the service may not be - every small provider has downtime, perhaps proportionally to their size.

2. the tools to update Twitter are well understood, and you can get software that does scheduling of posts across multiple platforms, previews of what posts will look like, etc etc, and said preview works well on the many platforms that people are already using. People doing the updating may prefer to use those tools over what the internal tool gives them.


This app is just garbage. Can't even use it if you are rooted.

In what ways are you saying "Europe is absolutely obsessed with the US": politics, tech, capital markets, defense, economics, culture, cultural trends, unpredictability, something else? And how is that "obsessed" rather than "paying attention to"? Without you giving any specifics, can't tell if that is good-faith comment or trolling. For example US audiences are obsessed with Downton Abbey, or the Titanic, or the 15-minute city proposal, and Tarantino was obsessed with French names of McDonald's hamburgers, but noone built a broader claim on top of those.

What specific event and year were IYO the onset of what you're claiming?


A software office, or a driver support center? Aarhus is a pretty respected technical university, so a software office would make sense.

Can you say more?

Accounting goodwill might be one term, but it has multiple components (trust, reputation, market share, mindshare, track record, relationships, online and offline community presence, etc. etc.)

I only meant the artful term is 'goodwill' and not 'good will'.


That's not how Jason Bourne handled paperwork.


The primary thing cornering Canadian real-estate was investor corporations, rather than Chinese nationals. But it was easier politics to highlight Chinese nationals, esp. coming up to the Canadian election.


Doesn't it depend on the mix of diesel/petrol/electric? In particular many cities ban or restrict diesel.


Tyre pollution is significant regardless of fuel source.


EV's have 100% reduction of NOx/tailpipe VOCs, 100% reduction in soot/tailpipe particulates, 70% reduction in brake pad dust (due to regenerative braking), in exchange for 25% increase in tire wear.

Vehicles are capped at emissions of 3mg/mile of particulates and 30mg/mile of VOC's. Something like 1-2mg of tire material actually becomes airborne PM10 particles every mile (and only about 10% of that for PM2.5 particles).

So, EV's really do a great job reducing emissions from 35mg/mile to <2mg/mile (PM10) or even <0.1mg/mile for PM2.5. A 95%-99.8% reduction in air pollution near highways would seem absolutely fantastic for me and my children!

https://pmc.ncbi.nlm.nih.gov/articles/PMC11636205/#:~:text=W...


  > EV's have 100% reduction of NOx/tailpipe VOCs, 100% reduction in soot/tailpipe particulates, 70% reduction in brake pad dust (due to regenerative braking), in exchange for 25% increase in tire wear.
I replaced the tires on my Tesla model 3 at 74,000 km and they still had tread above the indicator bars. I'm now at 140,000 km and the tires look great, the back ones look like they're only about halfway done. I might be an outlier but my previous Subaru needed tires every 50,000 to 60,000 km.

Needless to say, the brake pads have never been touched and when I saw the left front one at around 110,000 to 120,000 to patch that tire, it looked like it was just installed. The regen braking almost completely eliminated the brake pad or rotor as a wear item.


Yeah, aren’t the EV tyre’s compounded differently in some way to account for the extra weight?

If the weight on each wheel is greater I’d have assumed the tyre would need to be harder, for the same performance.

I would have assumed that would counter the otherwise additional wear, but I keep hearing EV tyre pollution is higher and yet everyone who owns one has always said they aren’t changing tyres an more than they did on their combustion cars.


Given that tires have a range of warranties from 40,000 miles to 80,000 miles ... it's possible that the tires are wearing 25% faster but the consumers aren't noticing because it's still around the normal 40k-80k mile range.


No matter the warranty - I still notice when I replace them.

And the warranty requires proof of periodic rotation. If the tires are wearing evenly, as is the likely case for a new vehicle, then rotation costs significantly more than the pro-rated rebate.


Until one has a battery thermal runaway event.

Or an entire truckload of batteries catches fire.

StasheD is an engineer and firefighter, quite eye opening.

https://youtu.be/diaUMNONpvw?si=7lxYS8iJHLvCTUkt


One might similarly note the awe-inspiring destructive power demonstrated by tanker trucks of fuel catching fire and causing interstate bridges to collapse.

https://archive.ph/VadwU : Tanker Truck Fire Collapses Bay Area Overpass

https://archive.ph/4INYw : I-95 Overpass Collapses in Philadelphia After a Tanker Fire


Gasoline or diesel fires can be extinguished.

Lithium ion battery fires less so.

Surly you don’t mean to imply that a sufficiently large lithium ion battery fire couldn’t burn down a bridge?


You're speculating about something that hasn't happened, using something that doesn't exist; no body is driving batteries large enough to destroy a bridge about.

They are driving liquid fuel tankers that can do that around regularly.

Also consider that as battery tech improves new chemistries lower the risk of fire even more. E.g. sodium batteries are very stable right now and solid state will improve that further. There's no way you can make petrol less flammable.

You're going to have to face facts, battery powered vehicles are safer than petrol powered one.


The odds of an EV catching fire are lower than for a gasoline vehicle.

And safer, less-flammable kinds of battery are in development. Less-flammable kinds of gasoline are not.


Is that an aged adjusted statistic?

Or is it comparing with the entire gasoline vehicle fleet?


Consider that every single human being on the planet carries around a lithium battery in their pocket, at a large percentage of those batteries have experienced such damage that would destroy the glass screen on those devices, and yet people are not bursting into flames regularly, and even the defective batteries that Samsung distributed for a while only made events extremely rare.

Lithium batteries are pretty safe in practice.


Safe enough to not be allowed on air freight.

Safe enough to not be allowed in checked baggage on commercial passenger aircraft.

Safe enough to kill e-bike riders, safe enough to kill people at home charging their e-bike / e-scooter / electric car.

Perfectly safe.

No trade offs, just safety.


All of those apply to gasoline


I want you to travel with half a gallon of gasoline (i.e. 2 litres of petrol) in your hold and/or hand luggage. See how that goes for you.

And yet, people travel with one or often more than one battery devices as a matter of utterly unremarkable routine.


Why ask things that you can easily look up?


Sea lions don't merely "look things up", they ask you to do it for them.


Oh, sorry, I thought we were having a conversation.

My mistake.


"A civil conversation about my statement" quite.

I'm not buying it and you shouldn't be selling it.


This is all very off-topic to the original discussion about reduction in air pollution.


Nine PBS is the St. Louis, Missouri, affiliate.


Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: