IRIS - Buay Chun Leh
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Originally posted by iamgoondu:
THere are some busstops having the LCD Panel that display the bus arrival time.
Next time I will SMS IRIS and verify if there is any discrepancies between the two.
Lolx the LCD Panel also some not accurate too, I saw at Bedok MRT Bus stop de (not accurate) Svc 28 bus arriving lia0 , the Panel still can put 5 mins... -
i only use IRIS for services that have long frequency - just so i know how 'long' i have to wait.
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I tried IRIS again this evening on SBST200 and at the same bus stop. Here's the result:
Received reply at 1854h that NextBus will be 21min. That is bus shall arrive at 1815h.
Received reply at 1857h that NextBus will be 18min. That is bus shall arive at 1815h.
Received reply at 1906h that NextBus 4min (slow traffic, expect delay). That is bus shall arrive at 1910h.
Bus arrived at 1908h however.
If I choose to jalan jalan at the haw par villa, I will probably miss the bus.
So the lesson from here is that you have to SMS more frequent to get 'more' accurate results.
Again IRIS not up to standard yet.
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Need to clarify why I think the bus arrive 2min earlier (1908h instead of 1910h). When the bus arrive at the bus stop, I can sense that the bus was travelling at top speed. The bus continue to travel at top speed to BV. (enjoy that fast ride however).
So that's explain why the bus was 2min earlier. Or rather IRIS was not intelligent enoughto compute the correct speed the bus was travelling.
If such a system allows upto 5minutes in accuracy (tolerance) (due to traffic conditions on roads...), then IRIS in the first place should not have implemented.
I accept IRIS only if it can reply with up to +/- 1 minute tolerances.
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So far, i use Iris still quite accurate. Today just sms for service 52. tell me 9 mins, but 5 mins later another sms came that wrote "Next bus: 10mins .... .... Free update from SBST"
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You sms once, and they give you 2 updates?
And your first sms tell you NEXTBUS 9 min, and 10 minutes later you received another updates NEXTBUS 10min. So your first sms was not valid at all. And the bus indeed arrived 10min later?
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Correct, they gave me 2 updates ... and yup, the bus did arrive at abt 10~11 min later (after the 2nd sms) ...
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IRIS results will also vary. Use it with caution.
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i did an iris on 156 today.
i smsed at 6.09 while on my connecting bus 105 towards whitley rd to transfer. Said 6 min and 12 min
den i alight at whitley rd. i sms again. it was around 6.19. said arriving
true enough by 6.20 SBS8249Z arrived on 156.
so its not always unreliable. sometimes it works.
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So if not accurate, then you will pay $15 to take a cab instead is it?
I think this system is a waste of money.
Whether the bus arrives in 5 mins or 30 mins, you still need to take the bus.
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Originally posted by charlize:
So if not accurate, then you will pay $15 to take a cab instead is it?
I think this system is a waste of money.
Whether the bus arrives in 5 mins or 30 mins, you still need to take the bus.
If the system cannot provide accuracy upto 1minutes, (due to road traffic conditions or many other variables), I agreed that this system should not have kick off in the first place. Having bus plate that display the approximate arrival time will be enough.
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Other than trying on peak hours, why not try non-peak?
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iris is okay la
but sometimes i hate it when it takes super long for them to reply you
and it obvioiusly doesnt give you the estimated time, only the time where the bus travels at its current speed
reminds me of the lta signboard at most expressway entrance..
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Originally posted by xstryker:
iris is okay la
but sometimes i hate it when it takes super long for them to reply you
and it obvioiusly doesnt give you the estimated time, only the time where the bus travels at its current speed
reminds me of the lta signboard at most expressway entrance..
lol that onei thought they adjust it based on the traffic conditions too? i seen it go up when theres a jam and go down when there isnt.
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this morning i sent an iris message for svc 170 at bus stop 45139 (Kranji Station). usually for the part of 170X, it is like this:
Next Bus: Not in Service
Subsequent Bus: No Current Predictionthen this morning, the timings of 170X appeared...found it weird...
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Originally posted by iamgoondu:
Need to clarify why I think the bus arrive 2min earlier (1908h instead of 1910h). When the bus arrive at the bus stop, I can sense that the bus was travelling at top speed. The bus continue to travel at top speed to BV. (enjoy that fast ride however).
So that's explain why the bus was 2min earlier. Or rather IRIS was not intelligent enoughto compute the correct speed the bus was travelling.
If such a system allows upto 5minutes in accuracy (tolerance) (due to traffic conditions on roads...), then IRIS in the first place should not have implemented.
I accept IRIS only if it can reply with up to +/- 1 minute tolerances.
+/- 1 min tolerance? i dun think this is possible... sometime the bus wait for the traffic light to turn green already 1 min plus already... road conditions are not that easy to control.. bus can be at the previous bus stop and if u use iris, it will show arriving at your bus stop, but then bus might come 5 mins later, for many reasons -- many ppl trying to board at previous bus stop, passenger asking for direction with BC, BC assisting PIW in boarding or alighting, or simply the bus cant move because it was stuck behind another bus at the bus stop. then got to wait at traffic light.. some time, have to wait longer especially those busy right turn junction..
if you are not happy with Iris, it is your choice not to use it. If not, maybe you can design a better system with 100% accuracy at lower cost than what SBST is paying.. -
if your not happy, dun use it. sometimes ppl are just plain stupid. they say this thing lousy lah, so useless, at the end they still use it.
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During CNY, while waiting at the bus stop opp far east plaza for 143, the LCD panel shows 33 minutes. Hoping it was not accurate, but was soooo accurate. It arrive 33 minutes later
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Originally posted by choww:
During CNY, while waiting at the bus stop opp far east plaza for 143, the LCD panel shows 33 minutes. Hoping it was not accurate, but was soooo accurate. It arrive 33 minutes later
cny 143 only got 11 buses before sa su ku (T shift) starts which is from 530-800. once sa su ku comes in, 15 buses running until 3pm where the 2 P shift comes in and becomes 17 buses. it den drops to 13 buses after sa su ku keep at 5 plus pm. *crazy*
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Originally posted by lemon1974:
+/- 1 min tolerance? i dun think this is possible... sometime the bus wait for the traffic light to turn green already 1 min plus already... road conditions are not that easy to control.. bus can be at the previous bus stop and if u use iris, it will show arriving at your bus stop, but then bus might come 5 mins later, for many reasons -- many ppl trying to board at previous bus stop, passenger asking for direction with BC, BC assisting PIW in boarding or alighting, or simply the bus cant move because it was stuck behind another bus at the bus stop. then got to wait at traffic light.. some time, have to wait longer especially those busy right turn junction..
if you are not happy with Iris, it is your choice not to use it. If not, maybe you can design a better system with 100% accuracy at lower cost than what SBST is paying..I understands the constraints that may give rise to the 'inaccuracy' of the system, traffic conditions for instance. And all the points you bring up are valid, that is it is very difficult or rather impossible to come up with a IRIS system that can give a +/- 1 minute accuracy.
So my point is, if at the beginning, we are aware of the constraints that IRIS will not be a 'accurate' system, rather it can only provide an approximate time, why bother to come up with such a system? Anyway average waiting time for most buses will probably less than 10 minutes.
I appreciate having IRIS if average waiting time for most buses were 45 min / 1 hour however.
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As for the train, the approximate arrival time is good, because it provided a fairly accurate timing on the next arriving train.
To implement it for our train system is good, but it does not mean that the same 'approximate time' system is suitable to our buses as well.
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Originally posted by iamgoondu:
As for the train, the approximate arrival time is good, because it provided a fairly accurate timing on the next arriving train.
To implement it for our train system is good, but it does not mean that the same 'approximate time' system is suitable to our buses as well.
Yea..because of the popular disclaimer for buses: 'Subject to traffic conditions...'
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this topic was featured in asiaone.com/mypaper.. show that outsider really read what we wrote also...
http://motoring.asiaone.com/Motoring/News/Story/A1Story20090421-136440.html
copyright of sph/asiaone.com -
This is my second time that a topic raise here was reported in SPH media. It feels good.
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I believe the concept behind IRIS is a good one, because anyone who has a handphone can get the timing of the bus and plan their time.Not all systems are reliable sometimes. Although IRS unreliable at times, but if you want a precision that's unmatched i guess you'll really have to find that pyschic in the IRIS ad.