this post was submitted on 19 Apr 2026
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cross-posted from: https://feddit.it/post/28637207

Those who use the bike know this very well: in the city, speeding motorists overtaking other cars, only get one thing: they arrive first to the next red.

With a simple model, the author estimated the probability that one car that overtakes another, will then be reached again at a later red light. Then he estimated the probability that the same thing will happen when there are multiple successive traffic lights, as usual in the cities.

The result is that as fast as an aggressive driver goes, the presence of multiple traffic lights makes it virtually certain that a slower driver will catch up

So, if someone aggressively overcomes you, when you reach him at the next traffic light, you can tell him that it is mathematically proven that he/she is an idiot.

In addition, this study has implications for the 30 km/h city, demonstrating how in urban areas the traffic lights determine the travel times, not the maximum speed reachable between one traffic light and the next.

The original scientific article is here: https://royalsocietypublishing.org/rsos/article/13/4/260310/481212/The-Voorhees-law-of-traffic-a-stochastic-model

crossposted from: https://poliversity.it/users/rivoluzioneurbanamobilita/statuses/116419204210303856

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[–] taiyang@lemmy.world 6 points 2 hours ago

The worst is when they cut me off for their pointless first at red because I'm turning right and would do so legally but it's not a dedicated right turn lane so now I get to wait for green with this asshole who's going straight.

Hell half the time in a dedicated right lane they cut me off and illegally go straight. It's fucked. I'm just trying to drop off my kids, damnit.

[–] DarrinBrunner@lemmy.world 11 points 4 hours ago (1 children)

If your commute is 30 minutes, you'd need to drive twice as fast to do it in 15 minutes. So, in the 35MPH zone, you need to do 70, and in the 50MPH zone, you need to do 100--consistently. Which is clearly impossible. If you follow this logic through to a realistic conclusion, you end up at saving at most two or so minutes by speeding as much as you can. Congratulations, you got home two minutes earlier, what will you do with all that free time?

Also, the idea that you've "saved time" is a bit silly. It's not like you can bank that time. You're not going to start work two minutes earlier every day, and end up with ten minutes of "free time" at the end of the work week. You get to work two minutes earlier, or maybe two minutes less late, and you get home two minutes earlier, but that's the extent of the "savings". So what?

Do yourself and everyone else a favor, leave for work two minutes earlier and have a nice, easy commute. Stop being a dick, it's not your road, it's not your right, and it doesn't help you at all. Learn to control yourself, grow up, gain some emotional maturity, stop speeding around, you look like an idiot.

[–] HaraldvonBlauzahn@feddit.org 7 points 4 hours ago

Also, the idea that you’ve β€œsaved time” is a bit silly.

Not to mention that all the extra money which you will need for a car, instead of using public transport or a bike, will require extra paid work time which in many (not all) cases will annihilate any time savings you might have had.

[–] SCmSTR@lemmy.blahaj.zone 3 points 2 hours ago (1 children)

Lead, follow, or get out of the way.

Traffic is like the flow of water, you can absolutely be the one fucking it up for everybody else, be it by crashing, reordering the wait, or by making traffic out of sync with engineered timers to optimize flow.

If speed or order or rate doesn't matter, then the science behind traffic engineers must be imaginary.

Be safe AND don't be a fucking asshole. We are all in this together.

[–] SCmSTR@lemmy.blahaj.zone 2 points 2 hours ago

Imagine if you played factorio...

and some stuff on a belt was just like "You know what would make us get there faster? If I moved slower than everything else and made it hard or impossible to pass."

And then another belt had an object that got irritated by always getting stuck behind the first one and tried to go super fast, but then crashed and outright stopped the belt.

Neither of these are good.

[–] HaraldvonBlauzahn@feddit.org 4 points 3 hours ago (1 children)

And this is one reason more to limit speeds in cities to 30 kilometers per hour (20 mph).

[–] SomeOneWithA_PC@feddit.org 3 points 3 hours ago

30 is awful. I like 40 and 60 so much more. 30 might be still better than awful timed red lights.

[–] SomeOneWithA_PC@feddit.org 2 points 3 hours ago

The red light timings sometimes incentivizes to go faster as with 55-60km/h you can have a green wave and don't need stop at any red light. for that it is totally worth it to drive faster. i hate when red light phase is longer than green phase. there are some really bad decisions on how red light timings work. Most do drive their path to work twice and know the timings and those do know when to drive faster/slower and will drive more aggressive to not wait at that one stupidly timed red light and have to wait and have like 25% more time to commute twice! (20->25min). It's nice to calculate it with statistics but the way to work and back is better known and a slower driver might cause you to need to wait at multiple red lights while you could have driven a bit faster (and not always faster like in my first sentence but driving as fast as is allowed) and did not have to wait at any of that stupid red lights. I'm all for speed limits and better bike lanes etc. but driving slow when it's stupid and stealing others precious time is fucking awful. What i also like are those that drive 60-70 constantly. Fuck man drive 100 if it is allowed and you can and drive 50 in the city but know, slow you down and than don't even drive slower for the safety of entices in the city.

[–] reddig33@lemmy.world 8 points 5 hours ago

But I have to get to the red light before you do! /s

[–] SeeMarkFly@lemmy.ml 5 points 5 hours ago (1 children)

I hate it when people get in front of me just to slow me down. All the time.

[–] chiliedogg@lemmy.world 7 points 5 hours ago (1 children)

Try driving an RV sometime. People have a moral obligation to pass you I guess, because you can be driving warp 8 and people will pass you angrily before slowing down.

[–] SeeMarkFly@lemmy.ml 2 points 3 hours ago

I used to drive a full size van. On foggy days I can see better than most other cars due to me being much higher off the ground. A lot of times the person behind me thinks they can go faster because they can see my tail lights.

They will pass me and realize they can't see ANYTHING and then go much slower than I was when they were behind me.

Same on rainy days. The cars kick up water off the road and make a haze that I sit above in my van. I can see better so I can go faster...until they pass me.