619
Geometry hates cars
(lemmy.ml)
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 03 Aug 2023
619 points (94.9% liked)
Fuck Cars
9758 readers
10 users here now
This community exists as a sister community/copycat community to the r/fuckcars subreddit.
This community exists for the following reasons:
- to raise awareness around the dangers, inefficiencies and injustice that can come from car dependence.
- to allow a place to discuss and promote more healthy transport methods and ways of living.
You can find the Matrix chat room for this community here.
Rules
-
Be nice to each other. Being aggressive or inflammatory towards other users will get you banned. Name calling or obvious trolling falls under that. Hate cars, hate the system, but not people. While some drivers definitely deserve some hate, most of them didn't choose car-centric life out of free will.
-
No bigotry or hate. Racism, transphobia, misogyny, ableism, homophobia, chauvinism, fat-shaming, body-shaming, stigmatization of people experiencing homeless or substance users, etc. are not tolerated. Don't use slurs. You can laugh at someone's fragile masculinity without associating it with their body. The correlation between car-culture and body weight is not an excuse for fat-shaming.
-
Stay on-topic. Submissions should be on-topic to the externalities of car culture in urban development and communities globally. Posting about alternatives to cars and car culture is fine. Don't post literal car fucking.
-
No traffic violence. Do not post depictions of traffic violence. NSFW or NSFL posts are not allowed. Gawking at crashes is not allowed. Be respectful to people who are a victim of traffic violence or otherwise traumatized by it. News articles about crashes and statistics about traffic violence are allowed. Glorifying traffic violence will get you banned.
-
No reposts. Before sharing, check if your post isn't a repost. Reposts that add something new are fine. Reposts that are sharing content from somewhere else are fine too.
-
No misinformation. Masks and vaccines save lives during a pandemic, climate change is real and anthropogenic - and denial of these and other established facts will get you banned. False or highly speculative titles will get your post deleted.
-
No harassment. Posts that (may) cause harassment, dogpiling or brigading, intentionally or not, will be removed. Please do not post screenshots containing uncensored usernames. Actual harassment, dogpiling or brigading is a bannable offence.
Please report posts and comments that violate our rules.
founded 3 years ago
MODERATORS
The point he makes is correct of course, but the way he does the comparison is not very honest. If he wants to compare to the maximum capacity of a tube train, he'd also have to take the maximum capacity of a car, not the average passengers.
But this is what happens. Every rush hour the roads are packed with cars, mostly just with one person in them, while the trains are actually full.
During rush hour you definitely won't have a distance of 10 meters between each car though.
If they're moving there should be, and if not it doesn't seem fair to me to compare transport to a car park.
If the cars are moving at over 5m/s then there will be for minimum safe followong distance.
If they are moving under that, you don't have a transport system that is more capable than a brisk walk.
5 m/s is 18kph or ~11mph.
40kph safe stopping distance is 26 meters dry, 30 meters wet. I can't even find data below 40 kph, but 10m would be reaction time alone (no bake time)
The average speed in London is 8 mph overall, taking traffic into account.
Average speed yes, but I doubt anyone is doing 8mph.
It's likely they drive closer to 20 mph (needing a larger safe distance) then stop at lights (needing no safe distance, but probably 3-5m if you have the driving school of thought to be able to have an exit at all times). Then there is all the space occupied by the intersections themselves. These would further space out cars, bringing the average length of X cars higher.
These are all guesses based on my local knowledge, I have been to London in close to a decade, and I did not drive there.
Generally guidance for "safe" following distance is to be able to stop before you hit a car that is also stopping with the assumption that the car ahead is stopping at the same rate. So 2 seconds of headway between cars (roughly reaction time alone). Obviously this does not give enough time if the car ahead has a head on collision or similar (but the third car will collide at lower speed and the fourth might stop).
Most traffic is a little closer together than this (hence the prevalence of pile ups), but there is also uneven speed and gaps at traffic lights and similar
You’re making good points and all but I keep reading your username as SchrodingerShat
It's a superposition
True. The usual traffic congestion has 2 - 3 meters.
Sure, but only because they aren’t moving. It should be about the distance traveled in a couple seconds. Less then that and you get a lot of wrecks, so brand new problems.