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Montreal Parking Meters Run Linux

jbecherv writes "According to LinuxDevices.com, new-fangled Montreal parking meters run embedded Linux (Google Cache). The City of Montreal is planning to roll out 500 to 800 wireless, solar-powered parking payment stations based on embedded Linux. There is even a device profile (Google Cache) that show some details about the meters... These meters run kernel 2.4.19 on a 206MHz StrongARM SA-1110. Each system has 64MB of RAM, boots from a CF device, and is networked wirelessly via GPRS."

69 of 506 comments (clear)

  1. I know little about embedded devices by Neil+Blender · · Score: 5, Insightful

    But that seems like a lot of RAM. Is it?

    1. Re:I know little about embedded devices by and+by · · Score: 4, Interesting

      But there's no harddrive, so it can't use swap space and it has to have the whole (probably very small) filesystem in RAM.

    2. Re:I know little about embedded devices by Kenja · · Score: 5, Informative
      "But that seems like a lot of RAM. Is it?"

      Oods are this is using a SODIM setup. In which case 64MB is the smallest amount of RAM you can get.

      --

      "Have you ever thought about just turning off the TV, sitting down with your kids, and hitting them?"
    3. Re:I know little about embedded devices by OECD · · Score: 4, Funny

      But that seems like a lot of RAM. Is it?

      Well, it is now. But once they start clustering them...

      --
      One man's -1 Flamebait is another man's +5 Funny.
    4. Re:I know little about embedded devices by Anonymous Coward · · Score: 4, Funny
      What swap space?

      We have 'parking meters' here. Near as I can figure they need to know exactly two things:

      • How much that coin you just put in was
      • How much time is left, now that you put in that coin.
      What's that, two bytes? Hell, have three.

      64MB CF? I can't wait for these to get hax0red.

    5. Re:I know little about embedded devices by Short+Circuit · · Score: 4, Informative

      CF is actually an interface(and really, it's just a repackaged ATA interface)...not really a device. IBM sells hard drives that conform to the CF interface. There are also flash devices out there.

      And I wouldn't use it for swap space, anyway. When developing an embedded system, you really should slim your memory footprint as far as possible, so you'd fit inside your available RAM.

      The way old-timer software developers talk about it, your really start thinking of proper memory usage as a nearly-lost art.

    6. Re:I know little about embedded devices by Feyr · · Score: 4, Funny

      remember, we burned down your white house once, no reason we can't do it twice *grin*

    7. Re:I know little about embedded devices by raider_red · · Score: 3, Funny

      How long until they start getting ripped off for people to use in their digital cameras?

      --
      It's good to use your head, but not as a battering ram.
    8. Re:I know little about embedded devices by lars · · Score: 3, Funny

      Yes. 64M of RAM ought to be enough for anyone.

    9. Re:I know little about embedded devices by Ben+Hutchings · · Score: 4, Informative

      They aren't parking meters. They are payment stations which each cover a large number of bays. They take credit cards (which need to be validated) as well as coins, they can report which bays have been paid for and which haven't, and they can adjust prices according to (anticipated) demand.

  2. Solar powered? by Kenja · · Score: 4, Interesting

    I can't recall where it was, but some other city tried using solar powered parking meters. They never worked due to insufficient light.

    --

    "Have you ever thought about just turning off the TV, sitting down with your kids, and hitting them?"
    1. Re:Solar powered? by millahtime · · Score: 4, Funny

      "I can't recall where it was, but some other city tried using solar powered parking meters. They never worked due to insufficient light."

      Oh, lemmie guess... Seattle.

    2. Re:Solar powered? by Albanach · · Score: 4, Informative

      They're in use throughout Edinburgh, Scotland. I guess solar technology has improved a bit, as we don't get that much sun and daylight hours in the winter are quite short.

    3. Re:Solar powered? by re-Verse · · Score: 4, Interesting

      Toronto uses them. I'm not sure if they use a backup power source as well (I guess they must) But if you live in TO, take a look on top of one of he master nodes (where you put in cash/CC and get a ticket for your card, and you will notice the whole top is a solar panel.

      I have no idea how much (if any) money this saves, but I think its really cool... and got way too excited about it the first time I noticed it.

    4. Re:Solar powered? by Tragek · · Score: 5, Funny

      How long did one have to put his/her hand on top of the meter before you could get free parking?

    5. Re:Solar powered? by genericacct · · Score: 3, Informative

      Here in Portland, OR, where it rains almost as much, we have quite a few of them (solar powered), and they work fine even on cloudy winter days.

    6. Re:Solar powered? by Quadrature · · Score: 3, Informative

      Funny eh? I work in Pioneer Square in downtown Seattle and just today they had some machines very similar to these in operation on Occidental just south of Yesler. They ripped out the old meters and hiked up the rates by 50% too. Ahhh progress. I even found a link.

  3. Is it just me... by Anonymous Coward · · Score: 5, Insightful

    Or does a 206 MHz processor with 64 MB of ram seem like DRASTIC OVERKILL for a parking meter?

    Seriously, what's the deal?

    1. Re:Is it just me... by agent+dero · · Score: 4, Insightful

      one thing to remember is that usually this are the cheapest most compatible parts.

      it's cheaper for the meter company to get very generic, albeit overpowered, parts that will 'just work' then tinker with lower grade hardware

      --
      Error 407 - No creative sig found
    2. Re:Is it just me... by Adriax · · Score: 5, Funny

      Wireless, takes credit cards, covers 12 spots, and deals with goverment bureaucracy.
      Seems a bit underpowered when you add that last part in.

      --
      I don't suffer from insanity, I enjoy every minute of it!
    3. Re:Is it just me... by nomadic · · Score: 5, Funny

      Or does a 206 MHz processor with 64 MB of ram seem like DRASTIC OVERKILL for a parking meter?

      Nah. But admittedly the nVidia GeForce 6800 they put in each one may be a bit much...

    4. Re:Is it just me... by Citizen+of+Earth · · Score: 4, Funny

      Or does a 206 MHz processor with 64 MB of ram seem like DRASTIC OVERKILL for a parking meter?

      It runs Java.

  4. Going, going, gone by medication · · Score: 5, Funny

    Poor parking meters now they'll be the target of drunk geeks as well as drunk frat boys.

    --
    "If you're flammable and have legs, you are never blocking a fire exit." - Mitch Hedberg
  5. Snow powered? by jasno · · Score: 4, Funny

    Lemme get this straight..

    Solar powered, in MONTREAL???

    Guess the StrongARM takes less power than I thought...

    --

    http://www.masturbateforpeace.com/
  6. Free Software by Coyote · · Score: 5, Funny

    Software should be free as in Free Parking.

    --
    My metamoderation cancels your moderation
  7. great. by garcia · · Score: 3, Insightful

    Centralized control enables city officials to adjust rates on the fly, for example raising the rates during sporting events, concerts, or other times of high parking demand.

    as if meters aren't expensive enough... We really needed someone to come up w/the bright idea to allow dynamic changes to parking meters.

    The last parking meter I parked at was 25 cents for 10 minutes. That's just nuts. This will just enable them to have meters that take credit cards forcing even higher rates.

    Want a way to stop people from coming downtown? Raise the rates on the meters even higher.

    1. Re:great. by Frohboy · · Score: 4, Interesting

      Montreal actually has an excellent subway system, and fairly narrow, busy downtown roads. (More European-like than any other city I've been to in North America.)

      As someone who learned to drive on the crazy downtown streets of Montreal, I feel I can happily endorse city's public transit. :)

    2. Re:great. by delibes · · Score: 5, Informative
      You wimps! In London parking's 4 (about $7?) per hour. (Hey why doesn't £ work when I preview?)

      Parking meters in London

      London Congestion Charge

      The congestion charge has pros and cons. It seems to reduce traffic somewhat, generates money to be used for buses, and probably cuts pollution. Some argue it works too well, hurting businesses in the central zone, and some people are occasionally sent a fine for not paying the charge even though they never went near the central zone. It works by a camera trying to OCR the license plate. The recognition can go wrong, and the camera can take snaps of people who don't actually enter the zone occassionally.

      Still, personally I'm in favour of it - I don't drive in London because it gets in the way of my drinking.

      --
      This is not a sig
    3. Re:great. by Albanach · · Score: 4, Insightful
      as if meters aren't expensive enough... We really needed someone to come up w/the bright idea to allow dynamic changes to parking meters.

      Surely this is a perfect use of the market to determine price. We all accept that if we book a flight at an off peak time we'll get a cheaper price - why not the same for parking? Cities get busy during the day but are often quieter in the evening. What a boon for restaurants if parking can be set at $2 for the entire evening. If there's a big evening even on then $2 is too cheap - all the spaces will fill and chaos ensues, so adjust the rate to $4 an hour and encourage folk to take the metro / bus / taxi instead.

    4. Re:great. by Keith+McClary · · Score: 3, Insightful

      We really needed someone to come up w/the bright idea to allow dynamic changes to parking meters. ...
      Want a way to stop people from coming downtown? Raise the rates on the meters even higher.


      Suppose you dynamically adjusted the rates so high that 10% of the parking spaces were always vacant.
      Then rich folks could always be sure of finding parking.
      Wouldn't that make downtown merchants happy?

    5. Re:great. by Mr.+Flibble · · Score: 3, Informative

      as if meters aren't expensive enough... We really needed someone to come up w/the bright idea to allow dynamic changes to parking meters.

      The last parking meter I parked at was 25 cents for 10 minutes. That's just nuts. This will just enable them to have meters that take credit cards forcing even higher rates.

      Want a way to stop people from coming downtown? Raise the rates on the meters even higher.


      You ever tried to find parking in downtown Montreal during an event? Hell, there is a reason when I lived in Montreal I did not even bother to get my drivers licence. The transit system there is wicked, and you can get pretty much anywhere you need to with it. But parking in the downtown core? It was always a pain in the ass. There is just not enough parking there, hell, when I went back to visit, I parked on the outskirts and took the metro to get downtown. I saved time on the parking.

      Look at it this way - it is a tax on those who are too lazy to take the public transit system, which is better for the environment anyhow. With the amount of parking space that is there I have no sympathy for anyone who drives in circles around the St. Catherines St Laurent area looking for a spot.

      --
      Try to hack my 31337 firewall!
  8. how hackable is something like this? by circletimessquare · · Score: 4, Interesting

    i'm not saying embedded windows is safer, i'm just wondering if someone could easily hack this system, it would be interesting if someone got free parking in the city

    --
    intellectual property law is philosophically incoherent. it is your moral duty to ignore it or sabotage it
    1. Re:how hackable is something like this? by photon317 · · Score: 4, Insightful

      I'm sure someone will eventually notice an applicable remote exploit, it's bound to happen at some point. If they designed the embedded devices to be static (everything important on read-only roms, software upgrades to be done by running around to each one physically and replacing them), then as time passes the likelyhood of exploit will only grow and grow. If they designed them to be auto-updateable over the wireless network, then when someone finds an exploit before they manage to patch said exploit, they'll probably use it to re-install things their own way across the network, locking out further updates from the city, forcing the city guys to go out and manually clean out each machine by hand (erase/replace the flash storage that the OS and binaries was on).

      --
      11*43+456^2
    2. Re:how hackable is something like this? by noda132 · · Score: 3, Insightful

      ...forcing the city guys to go out and manually clean out each machine by hand...

      But with old-style parking meters, city guys go out and manually clean out each machine by hand every day.

  9. Imagine... by FrYGuY101 · · Score: 5, Funny

    Imagine a Beowulf cluster of those! Hours of parking time could be finished in minutes!

    --
    "If we let things terrify us, life will not be worth living."

    - Seneca
  10. Sharpie Permanent Marker by kyoko21 · · Score: 5, Funny

    So what is going to happen when someone comes along with a thick black Sharpie Permanent Marker and mark the solar panel all black?

    1. Re:Sharpie Permanent Marker by Rikus · · Score: 4, Insightful

      So, how about when somebody comes along with some chewed bubble gum and sticks it in the coin slots of the old parking meters? People are jerks.
      Maybe they could put the solar panels on poles?

  11. Re:Okay... by Anonymous Coward · · Score: 5, Funny

    ...but does it run Windows?

    You'll know they switched when you come to Montreal and the streets are bathed in an eerie blue light.

  12. Simple and Reliable by 511pf · · Score: 5, Insightful

    Parking meters are simple and reliable. Nothing like taking something that just works and replacing it with something else that is infinitely more complex, break-prone and expensive. Besides which, people will never use these things successfully. "Put coin in slot next to car" is as smart as people are. Seriously. People are going to pay for the wrong parking spots, pay too much money, and so on. Bad idea.

    1. Re:Simple and Reliable by bear_phillips · · Score: 3, Informative
      Nothing like taking something that just works and replacing

      Where did you get the idea that old style parking meters "just work." Many are based on a wind up mechanism for the timing. They are notorously inaccurate. There is a reason people switched from wind up watches to digital watches.

      --
      http://www.windmeadow.com/
  13. Detroit parking meters by millahtime · · Score: 3, Interesting

    Detroit is rolling out high tech ones too

  14. it would be cool... by foQ · · Score: 4, Interesting

    it would be cool if you could pay for your car online if a meeting runs long or something. other than that, this seems like more of a waste of money and raises the risk of them getting stolen. stealing the old fashioned ones is cool, but stealing a bunch of portable solar computers would be bad-ass!

  15. spare MHz? by Janek+Kozicki · · Score: 5, Interesting

    few hunderds of spare 200 MHz ? I wonder if their administrator will resist the tempation of installing disturbed computing client (like seti@home, or distcc >;-)

    --
    #
    #\ @ ? Colonize Mars
    #
  16. And the reason is? by BrodyVess · · Score: 5, Insightful

    I have a parking meeter "obtained" from the storage room of my local municipality about 20 years ago. They had been out of service for 10 years, and installed 10 before that. Old enough that you could buy 8 minuites for a penny, anyway. Now, when I was playing with it as a kid- it still worked. Heavy as hell, was death on toes, but it still worked. In 40 years, where will these be? How will they be safely disposed of?

    Just like touch screen voting, this seems like a "because we can" application of technology. Sometimes there's no reason to replace what works. The old steel parking meters are quite literally bulletproof. I simply cant imagine any reason that makes networked meters any better.

    Of course, when I moved to DC I sold my car and bought a bus pass, so what do I know?

    --
    No one expects the Spanish Inquisition!
  17. Overkill by Quebst · · Score: 3, Insightful

    Isn't this just a bit much for a parking meter? The more simple a solution, usually the better. There would be a reduction in moving parts with using the new devices, but I don't think that and the network idea are enough to justify this. The fact is the more complex things are made, the better chance of something going wrong. Even in the article they mention having to fix a bug. What will happen when another bug starts shorting people ticket time and they have to deal with a mob of angry car owners? Solar power is good and all, but has it ever been used successfully on such a project? It looks like politics took control and pushed special interests ahead of common sense. At least they're not running Windows PM special ultra extreme .NET software.

  18. Instructions by Atario · · Score: 3, Insightful
    1. Go to meter at 3am (no sunlight...power down)
    2. Cut open computer's chamber
    3. Attach your favorite distro on HD/CF/whatever
    4. Attach battery
    5. Log in
    6. Have fun with the parameters
    7. If credit cards are accepted...Profit!
    --
    "A great democracy must be progressive or it will soon cease to be a great democracy." --Theodore Roosevelt
    1. Re:Instructions by sahonen · · Score: 4, Interesting

      I dunno about you, but most parking meters I've seen have been made out of nice, solid metal to keep people from breaking in and taking out the change. I think these meters would be built the same.

      Also, they would probably have batteries to keep them running during periods of no sun... Otherwise, free parking on cloudy days, or you put in your money, come back and have a parking ticket because a cloud passed over the sun and reset the meter.

      --
      Make me a friend and I'll mod you up
  19. Where is the soruce code? by David+Hume · · Score: 4, Interesting


    The Device Profile states, "The stations run a Linux distribution that 8D developed in-house." Where is the source code? I searched:

    8D

    http://www.8d.com/

    But couldn't find anything. How can we efficiently build on 8D's work to build a better, competitive parking meter without the code?

    1. Re:Where is the soruce code? by Vicegrip · · Score: 3, Insightful

      "Where is the source code? I searched"

      It looks like your making a joke, but I figured I'd mention this anyways as people seem to get confused at times about what the GPL demands of distributors.

      The GPL states their obligation for supplying the code is to those who receive their products and by inferrence to whom they have distributed the imbedded Linux binaries to.

      It looks like to get the code you're going to have to buy a traffic meter from them or ask for it from one of their current customers.

      --
      Do not spread "09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0" over the internet, thank you.
  20. Darl's Comments by ptelligence · · Score: 5, Funny

    Excerpt from SCO's reactionary press release: "Anyone who parks at one of these meters is in effect using Linux, and therefore owes SCO $699 + 25 cents per half hour."

    -Darl

    Somebody e-mail me the free parking exploit

  21. Amazing by almaon · · Score: 3, Insightful

    Normally any conversation taking place about technical advancements of parking meters is usually left to the pub with the intoxicated...

    But alas here I am... sober.

    What I wonder is, being able to use your cell phone to pay for your parking fare on such a possible UBER METER, would it also SMS or phone you to nag you that your time is almost up and it's time to "feed" the meter?

    Anyone that remembers pay toilets is surely dieing for info on state-of-the-art bleeding edge toilet tech. Anyone have any info on computerized pay toilets?

  22. Wow by Senjutsu · · Score: 3, Insightful

    You had a 40 year old parking meter that would let you add more time to it from any other parking meter in the city (rather than having to run across the block/campus/city to that particular parking meter)? And the city could dynamically adjust the rates for a given area of the city in order to curtail congestion patterns??

    That's incredible!

  23. parking tickets by Barbarian · · Score: 5, Interesting

    Sounds like these meters will automatically tell the parking officer when your time is up. They could even combine them with pavement sensors and photo recognition (or RFID!) in the future to automatically ticket you.

    1. Re:parking tickets by Dun+Malg · · Score: 3, Informative
      Why bother ticketing when the time expires? Let me swipe my credit card, and have it bill me to the exact second my car leaves the stall. Save money on tickets, ticketing officers, complaints, and time!

      Actually, they make more money writing tickets, even taking the cost of employing people to write tickets into account. As for time and complaints, I've never seen a municipal office that wasn't perfectly willing to let you waste your time complaining to them... :)

      --
      If a job's not worth doing, it's not worth doing right.
  24. Re:hack it by Keith+Russell · · Score: 4, Funny
    ...lower the price during sporting events to say $0.00.

    That would be nice for Canadiens games. But if you want me to attend an Expos game, you'll have to set the parking meter to pay me.

    --
    This sig intentionally left blank.
  25. Potential Application by GillBates0 · · Score: 4, Insightful
    Meter maids can cruise for violators using ruggedized Intermec handheld devices inside their vehicles. The devices have built-in city maps on which paid spots are green and unpaid spots are red.

    I would like them to come up with a device (or a GPS plugin or whatever) which would show me the empty parking spots available in a radius around my current location.

    I would think most people who work/commute downtown and don't want to pay monthly parking fees would be willing to shell out big bucks for such a feature.

    Certainly beats crawling around the roadside for hours trying to find a parking spot.

    --
    An Indian-American Hindu committed to non-violent thought/speech/action alarmed by the global explosion of radical Islam
  26. Not cool from city's point of view by Atario · · Score: 4, Insightful

    They don't want you paying the meter like you're supposed to. If you do, they only get 25 cents per 15 minutes or whatever (which would be a maximum of, what $24 per day? Even if they are in force 24 hours, which few are?). If you fail to pay, and the meter-maid spots it, they get $25 (or similar). They get more (possibly far more) for one ticket than for a whole day of good little parkers.

    This is why there's often a short maximum total parking time limit -- gotta have turnover. The more people park, the more tickets have a chance of getting written.

    This is also why you see news stories every now and then about people who go around feeding other people's meters getting arrested or otherwise harrased. These Helpy Helpertons cut down on revenue.

    Municipalities don't want obedience, they want money. The parking-meter scam is but one method.

    --
    "A great democracy must be progressive or it will soon cease to be a great democracy." --Theodore Roosevelt
  27. Another reason to steal parking meters... by puppetman · · Score: 4, Interesting

    In greater Vancouver, we have dodgey characters that drive around with hacksaws, decapitating the meters for the change inside. A thousand dollar parking meter gets destroyed for $40 in change.

    In Montreal, it will be geeks with hacksaws. Rather than being tossed into a lake, the parking meters will show up in a home-built robot.

    1. Re:Another reason to steal parking meters... by KJE · · Score: 3, Insightful
      Ok, has anyone actually RTFA? Take one look at the picture of the machine, and then tell me you'll be choping it up with a hacksaw.

      This mostly comes from the poster calling it a "Parking Meter" when it is more like a "Parking Pay Station".

  28. Re: seem like a lot of RAM. by nomel · · Score: 4, Funny

    where do you think it holds all the quarters?

    .

  29. Parking meters are not more reliable by neile · · Score: 4, Interesting

    There was an article in the Seattle PI today about Seattle's plans to do this exact same change:

    Up to 80 parking meters are out of service on any given day, Krawczyk said. The pay stations are much more reliable.

    The article also talks about how Portland made the same switchover, and the successes they had:

    "They've worked wonderfully for us," McCoy said, adding that "Seattle people have been down here on a number of occasions" to study the Portland pay stations. Portland's pay stations have been less expensive to maintain than the oft-malfunctioning meters. And the credit cards have reduced the costs of handling coins, he said. "From a customer perspective, having the ability to make card transactions has been the big benefit down here," he said. About 50 percent of Portland's parking revenue now comes via credit cards.

    Neil

  30. Achilles Heel of These Parking Meters by ortcutt · · Score: 5, Funny

    Just try getting those things to play sound. Even parking meters that ran Windows 95 could find the sound card with no problem.

  31. Re:$2,000,000 parking fees at a hacked meter! by Cordath · · Score: 5, Funny

    Here are some more fun hacking ideas:

    -Program the meters to play "We're into Money" in beep tones whenever somebody swipes their card.
    -Program the meter to prompt the user to find out what class of car they drive. If it's a SUV, the meter will refuse to let them park because the gargantuan heap blocks out the sun the meter needs to run.
    -Program the meter to randomly scramble PIN numbers that users input.
    -Program the meter to randomly pop up Microsoft error messages. We wouldn't want parking meters to give Linux a bad name now would we?

  32. Q Temperature? by 4of12 · · Score: 3, Interesting

    Solar powered is great, but what happens when those Montreal winters come blasting?

    Most batteries don't fare well as the temperature plummets towards -40, either.

    --
    "Provided by the management for your protection."
  33. -1, pun by PsiPsiStar · · Score: 4, Funny

    With its cache.
    *ba dum bum*

    --

    ___
    It's the end of my comment as I know it and I feel fine.
  34. Parking Meter Overkill by salmonz · · Score: 5, Informative

    Hi,

    I work for Precise Parklink, the provider for the Toronto Parking Authority and many municipalities in Ontario and Western Canada. Our machines are solely based on a EPROM with very little data stored. Why would anyone need 64MB? Our machines also operate on GPRS GSM 'and' Mobitex, solar power, wireless, etc. There's no kernel, no flash card, and works great. One thing that would really impress me is if these Linux machines could accept debit, and most of all, if someone is able to hack it. Also, storing credit card data on a compactflash card garentees the data always exists, which is a bad thing if someone were to tamper with the machine. With our machines, the transactions aren't stored on the EPROM, but instead on RAM. If the machine is turned off or reset, the cc data is lost and the parker is safe from someone stealing their credit card number. Bottom line, the more advanced technology gets for parking meters, the more susceptable to fraud, bugs, and security issues.

  35. Re:CF + Camera? by Total_Wimp · · Score: 3, Insightful

    Most pro and semi-pro digital cameras use CF. The primary reason for this is the very large amount of storage they can get in CF form factor, especially with a microdrive.

    The media you mentioned is strictly for the common folk (not meant as a slure: all my cameras use SD :-)

    TW

  36. These machines suck by Cyclone66 · · Score: 4, Interesting

    Here's why:

    There's one meter per block, at each parking spot there's a sign with a number. A123 or A435, B342, etc. You read your number, go to ANY machine in Montreal, punch in that number and you can put money in your meter. Now this is where they got greedy. They got sick of people using leftover time from previous 'customers' so any time you add money to a specific spot it resets to 0.

    So if there is 2 hours on the machine and I want to add an hour (you can only have a max of 3 hours) I will have to pay for the full 3 hours. Furthermore you can not see how much money is left on the meter except by looking at the ticket it prints.

    So if you have class and need to add a bit of money to the meter so it'll last till the end of class you have to add the full amount since it will restart.

    Now for the mischief. There's nothing stopping you from punching in someone else's number, adding 25 cents and reducing there time to 15 minutes! Essentially guaranteeing a ticket.

    So if someone has 3 hours on there meter, and you come by and put in 25 cents it will go to 15 minutes. This can be handy to use against people you don't like or just random strangers with nice cars, etc. Anyways it seems like a big problem.

    The only thing I was thinking is that maybe the machine will keep track of the OLD value as well as the new value to prevent this, but it's still screwing over people who want to add money to their own meter.