Live data from Hacker News

Berlin public transport in real time

fahrinfo.vbb.de

21–30 of 143 posts

Re: Berlin public transport in real time

#21
post #13

Isn't this a security concern?

In what way? You know, there are printed time tables hanging in all stations. They are even online, accessible from the middle east!

Timetables can change, 'live' data does not. But, if it's 'calculated' then you're right, and it's pretty much a visual timetable.

Also, I know you were joking, but let's not generalise and say middle east shall we? :)

Re: Berlin public transport in real time

#23
post #2

We so need this in the UK

London did, 5 years ago, for the London Underground: http://traintimes.org.uk/map/tube/ More recently, one London bus at a time: http://traintimes.org.uk/map/london-buses/#73 There's a decent amount of open rail data, and a website listing usages: http://www.openraildata.info/

This is cooler than the Berlin one tbh

Re: Berlin public transport in real time

#25
post #16

Isn't this a security concern?

I thought the same. But I can't actually come up with a good reason. Maybe German trains are so punctual that you can infer their position anyway. Can someone in Berlin measure the lag? Next time I'm back there I might test it.

> Maybe German trains are so punctual that you can infer their position anyway.

That's what the map is doing, anyway (plus delays).

Re: Berlin public transport in real time

#27
post #11

Isn't this a security concern?

According to the website, the location information isn't exact, but "calculated" (whatever that means).

It most likely means that there is no exact GPS data, but the company knows when trains arrive at a certain station and can calculate when the trains arrive at the next station (thus, they show us if a train or bus is late in minute-resolution). So it's easy to tell when a train is just departing, or when a train should be approximately 100 meters from the last station away, etc.

Re: Berlin public transport in real time

#29
post #16

Isn't this a security concern?

I thought the same. But I can't actually come up with a good reason. Maybe German trains are so punctual that you can infer their position anyway. Can someone in Berlin measure the lag? Next time I'm back there I might test it.

I can only speak for Berlin and will say punctuality is not the strong point of S or U-bahn here.

Re: Berlin public transport in real time

#30
post #14
post #8

Earlier quoted context omitted.

CGI lives. > Who would run this on a webserver? Who wouldn't? It's an executable. Just like your favourite language runtime. Just like 90% of the web.

It's quite easy to make this particular *.exe path return an "Internal Error" by fuzzing the GET parameters, which may or may not be due to someone having written something that parses user-supplied data in C that then segfaults :)

Assuming that they're even using C. It may as well be a dumped executable Lisp image.
Post reply on HN