4 ms·

Not to mention that "speed limit recognition" is a huge waste of resources in the era of GPS. If countries want that, they should just keep an up-to-date databa

by tomp 7y ago

Not to mention that "speed limit recognition" is a huge waste of resources in the era of GPS. If countries want that, they should just keep an up-to-date database of roads with their speed limits, and update that appropriately. Alternatively, companies could drive cars around (like Google does for its Maps), run speed limit recognition, do manual adjustments, and upload that to their online maps.

DFHippie 7y ago
You still need to deal with temporary speed limits in construction zones.
- maccard 7y ago
  And smart motorways
- kwhitefoot 7y ago
  And AP1 does that perfectly.
gambiting 7y ago
Well.....I wouldn't trust that either. My sister has an insurance policy with a tracker(because she's quite young and there was no other option for her) and one day we noticed that her insurance score has fallen down through the floor, hugely negative points for....speeding. Of course the website doesn't tell you where or when, just that you're being penalized for being naughty. Ok, so we call them up, and they say they will send us the exact coordinates where the "offence" happened. Ok, cool - and turns out that they thought she was driving 70mph on a road going next to the motorway - which had a 20mph speed limit. Which was literally physically impossible, as previous GPS points were showing her on the motorway and there was no direct exit to that smaller 20mph road. So the GPS was off by maybe 10-20 metres at most, but the insurance has automatically penalized her massively for speeding. What's stopping the same system from failing when used for automatic speed limit adjustment? Especially in some extremely dense cities where you literally have roads of varying speed limits overlapping each other. The insurer did correct that score penalty manually after I complained. But it's still a joke that it could make that mistake in the first place, especially since they can literally cancel your insurance due to speeding.
neffy 7y ago
Unfortunately, you really can't solve these kinds of questions with the full on deterministic approach. The world is big, speed limits change, databases have to be updated. Google maps was (dangerously in the winter) directing people to an old road, into mountains after a new one had been built. It took national news, and several months of attempts to get them to update it. The just build a big very accurate database approach is the one I would absolutely guarantee will never work.
- rayiner 7y ago
  Google also for a long time didn’t properly account for Rock Creek Parkway in DC going from one-way south, to bidirectional, to one-way north depending on the time of day. Also, it still doesn’t realize that the street I live on is a pedestrian street with car barriers at every other intersection. (You have to drive down the correct subdivision road from the main road, instead of just getting into the subdivision and expecting to be able to drive down the pedestrian road to the right house.) So Uber drivers will constantly call me saying they are stuck and can’t figure out how to get to me house. (The road was turned into a pedestrian road maybe 5-7 years ago now.)
  - londons_explore 7y ago
    Roads which have restrictions changing on a hourly/daily basis google doesn't understand, but there will be a warning in the directions ('this route contains private or restricted roads'). If there is something out of date, hit the report button and it's typically acknowledged immediately, confirmed in a few hours, and public within a few days.
    - rayiner 7y ago
      Google recognizes it now, but it took years. (For a major thoroughfare in the nation’s capital.) Just reinforcing OP’s point that you can’t rely on the map being up to date.

by tomp 7y ago

DFHippie 7y ago

You still need to deal with temporary speed limits in construction zones.

maccard 7y ago
And smart motorways
kwhitefoot 7y ago
And AP1 does that perfectly.

gambiting 7y ago

Well.....I wouldn't trust that either. My sister has an insurance policy with a tracker(because she's quite young and there was no other option for her) and one day we noticed that her insurance score has fallen down through the floor, hugely negative points for....speeding. Of course the website doesn't tell you where or when, just that you're being penalized for being naughty. Ok, so we call them up, and they say they will send us the exact coordinates where the "offence" happened. Ok, cool - and turns out that they thought she was driving 70mph on a road going next to the motorway - which had a 20mph speed limit. Which was literally physically impossible, as previous GPS points were showing her on the motorway and there was no direct exit to that smaller 20mph road. So the GPS was off by maybe 10-20 metres at most, but the insurance has automatically penalized her massively for speeding. What's stopping the same system from failing when used for automatic speed limit adjustment? Especially in some extremely dense cities where you literally have roads of varying speed limits overlapping each other. The insurer did correct that score penalty manually after I complained. But it's still a joke that it could make that mistake in the first place, especially since they can literally cancel your insurance due to speeding.

neffy 7y ago

Unfortunately, you really can't solve these kinds of questions with the full on deterministic approach. The world is big, speed limits change, databases have to be updated. Google maps was (dangerously in the winter) directing people to an old road, into mountains after a new one had been built. It took national news, and several months of attempts to get them to update it. The just build a big very accurate database approach is the one I would absolutely guarantee will never work.

rayiner 7y ago
Google also for a long time didn’t properly account for Rock Creek Parkway in DC going from one-way south, to bidirectional, to one-way north depending on the time of day. Also, it still doesn’t realize that the street I live on is a pedestrian street with car barriers at every other intersection. (You have to drive down the correct subdivision road from the main road, instead of just getting into the subdivision and expecting to be able to drive down the pedestrian road to the right house.) So Uber drivers will constantly call me saying they are stuck and can’t figure out how to get to me house. (The road was turned into a pedestrian road maybe 5-7 years ago now.)
- londons_explore 7y ago
  Roads which have restrictions changing on a hourly/daily basis google doesn't understand, but there will be a warning in the directions ('this route contains private or restricted roads'). If there is something out of date, hit the report button and it's typically acknowledged immediately, confirmed in a few hours, and public within a few days.
  - rayiner 7y ago
    Google recognizes it now, but it took years. (For a major thoroughfare in the nation’s capital.) Just reinforcing OP’s point that you can’t rely on the map being up to date.