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(MIT Technology Review)   You know those movies where some guy hacks into traffic lights and turns them all green? That could actually happen   (technologyreview.com) divider line 26
    More: Scary  
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1176 clicks; posted to Geek » on 20 Aug 2014 at 6:03 PM (31 weeks ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



26 Comments   (+0 »)
   
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2014-08-20 04:16:46 PM  
You don't need to "hack" them. They already sell devices on the internet to change lights from red to green.

http://www.10news.com/news/driver-cited-for-using-traffic-light-pree mp tor-device
 
2014-08-20 05:07:01 PM  
That would require upgrading the traffic lights so they're on a system. Not happening in my part of the world, where every farking light is red. I'd swear they were anti-timed. Slow everyone down by having to stop at each light.
 
ZAZ [TotalFark]
2014-08-20 05:19:04 PM  
In the old days there was a mechanical device to prevent invalid signal combinations. If the controller tried to turn conflicting lights green the light would automatically trip into flashing mode.

Now the failsafe is probably a software test in 39 of the 43 if-then-else clauses used to handle various mode changes, never tested properly, and a hacker with an antenna can go full xkcd if he likes.
 
2014-08-20 06:09:00 PM  
Crash and Burn?
 
2014-08-20 06:09:52 PM  
But can I jump a truck off an overpass and into a jetplane?

/or maybe that's wrong, its been a while since I watched that movie
 
2014-08-20 06:10:47 PM  

Walker: You don't need to "hack" them. They already sell devices on the internet to change lights from red to green.

http://www.10news.com/news/driver-cited-for-using-traffic-light-pree mp tor-device


Requires the lights to actually have a receiver.  I was surprised to discover that, for some reason, the ones in downtown Chicago apparently don't - every emergency vehicle that comes through has to carefully navigate the intersections instead of just switching the lights.
 
2014-08-20 06:12:47 PM  

ZAZ: In the old days there was a mechanical device to prevent invalid signal combinations. If the controller tried to turn conflicting lights green the light would automatically trip into flashing mode.

Now the failsafe is probably a software test in 39 of the 43 if-then-else clauses used to handle various mode changes, never tested properly, and a hacker with an antenna can go full xkcd if he likes.


From the article I read, it sounded like there still is, at least in this system, and it has to be physically reset.
 
2014-08-20 06:15:35 PM  

Walker: You don't need to "hack" them. They already sell devices on the internet to change lights from red to green.

http://www.10news.com/news/driver-cited-for-using-traffic-light-pree mp tor-device


This is on a much larger level. This hack doesn't just let you turn the light in front of you green. It lets you turn any light green. Everyone crossing your path gets a red light while you have greens the whole way without having to trigger each one as you get to them.
 
2014-08-20 06:19:44 PM  
Jack Lemmon's character approves.
1.bp.blogspot.com
 
2014-08-20 06:20:15 PM  

wildcardjack: That would require upgrading the traffic lights so they're on a system. Not happening in my part of the world, where every farking light is red. I'd swear they were anti-timed. Slow everyone down by having to stop at each light.


I had to check to make sure you weren't living in Boise.  I've been all around the west and there isn't a single city that's worse than here.  We also have the only county run highway district and they're more incompetent than the worst DMV and more corrupt than Crook County and Boston combined.
 
2014-08-20 06:44:56 PM  
dvdmedia.ign.com
 
2014-08-20 06:51:53 PM  
So it's a fire sale then?
 
2014-08-20 06:54:50 PM  

ZAZ: In the old days there was a mechanical device to prevent invalid signal combinations. If the controller tried to turn conflicting lights green the light would automatically trip into flashing mode.

Now the failsafe is probably a software test in 39 of the 43 if-then-else clauses used to handle various mode changes, never tested properly, and a hacker with an antenna can go full xkcd if he likes.


imgs.xkcd.com

??
 
2014-08-20 07:00:25 PM  
I like them big.
 
2014-08-20 07:00:38 PM  

mama2tnt: Jack Lemmon's character approves.
[1.bp.blogspot.com image 832x457]


He looks like he's just been told that the coffee is for closers.
 
2014-08-20 07:08:25 PM  
has anyone seen a movie like this?
 
2014-08-20 08:12:30 PM  
But more importantly, are there speakers loud enough to blow women's clothes off?
 
2014-08-20 08:13:02 PM  

moothemagiccow: has anyone seen a movie like this?


Live Free or Die Hard ?
 
2014-08-20 08:18:17 PM  
Are we talking about the Benny Hill Italian Job, or the remake that takes place in California?
/Shiat the light is yellow, I need to stop posting on Fark threads and hit gas on my mini-Cooper!
 
2014-08-20 08:25:49 PM  

ZAZ: In the old days there was a mechanical device to prevent invalid signal combinations. If the controller tried to turn conflicting lights green the light would automatically trip into flashing mode.

Now the failsafe is probably a software test in 39 of the 43 if-then-else clauses used to handle various mode changes, never tested properly, and a hacker with an antenna can go full xkcd if he likes.


They are electronic now but everyone I've seen is effectively a separate device inside the cabinet. That device isn't networked and is effectively just watching the outputs of the other systems.

That said... can't vouch for the testing/coding, I've never worked on a MMU.
 
2014-08-20 08:44:07 PM  

moothemagiccow: has anyone seen a movie like this?


The Italian Job (2003 version).

Which is also the source of Mad_Radhu's quote about speakers loud enough to blow a woman's clothes off.
 
2014-08-20 10:14:40 PM  

moothemagiccow: has anyone seen a movie like this?


media.tumblr.com

// As already mentioned, the Italian Job 2003 version.
 
2014-08-20 10:27:19 PM  
You're only supposed to blow the bloody doors off!
 
2014-08-20 11:37:25 PM  
But do they have  X-CaliBR8 ?
 
2014-08-21 12:39:32 AM  

Bajtaur: ZAZ: In the old days there was a mechanical device to prevent invalid signal combinations. If the controller tried to turn conflicting lights green the light would automatically trip into flashing mode.

Now the failsafe is probably a software test in 39 of the 43 if-then-else clauses used to handle various mode changes, never tested properly, and a hacker with an antenna can go full xkcd if he likes.

They are electronic now but everyone I've seen is effectively a separate device inside the cabinet. That device isn't networked and is effectively just watching the outputs of the other systems.

That said... can't vouch for the testing/coding, I've never worked on a MMU.


Whenever we turn on a new signal we test every possible bad combination of indications to make sure the MMU (or CMU) trips and puts it into flash. Pissing off all those drivers while we stop all traffic for 2-5 minutes is one of the perks of the job! The MMU will always trip within 450 milliseconds. It also cannot be reprogrammed remotely, it runs off of a big program card with allowed phasing combinations physically jumpered and soldered (NEMA) or disallowed combinations cut out (170/20170)
 
2014-08-21 01:17:20 AM  

Cybernetic: moothemagiccow: has anyone seen a movie like this?

The Italian Job (2003 version).

Which is also the source of Mad_Radhu's quote about speakers loud enough to blow a woman's clothes off.


He was only supposed to blow the bloody doors off.
 
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