Clone with Git or checkout with SVN using the repository’s web address. The rationale to send data is to speed up requests like large /map calls - the user can already begin to receive the data before the server has completed the request. While most users are diligent, the few that aren't would otherwise consume the vast majority of resources. Query would be something like Responding gracefully to non 200 responses from Overpass API ('Please try again later', or something else appropriate if the request timed out or ran into memory constraints on the Overpass side), Disallow rebuilding existing challenges within a day (or whatever other time delta makes sense). By clicking “Sign up for GitHub”, you agree to our terms of service and Learn more. I need to understand what access pattern you use: Is it many request in a very short time (100 in 10 seconds or so) or rather many long running, consecutive requests (10 each of which is running 1 minute)? Get speed limits from OSM's Overpass API within a certain radius of gps coordinates - overpass_speed.py there's no dedicated load balancer at all on Overpass side. The other thing is the delay of the HTTP 429. It would mean that you would have to buffer the result locally before sending to the client to be sure there's no timeout. In addition I think you could make use of other status codes to indicate problems with the api: https://www.ietf.org/assignments/http-status-codes/http-status-codes.xml. You can always update your selection by clicking Cookie Preferences at the bottom of the page. Overpass Api Python Wrapper. That's exactly what drolbr/Overpass-API#351 is about. Already on GitHub? There is inconsistency in tagging - some sections of the highway has the tag nat_ref=R0, but not all of them. Some ways to mitigate / solve this issue I see are: These are by no means the only or the complete solution, but I would like to arrive at something that is appropriate to the size of the problem. @drolbr I would usually do the rate limiting with a load balancer in front of the backend services. Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g. By the way, for France at least, default speed limits are tagged FR:urban (and so on) which is quite straightforward and without requiring the explicit knowledge of the speed limit. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. E.g. People using requests from a slippy map with some panning around. This overpass query can be used to extract current turn restriction in a bounding box. 4. I would expect that an API would send a 429 response without any delay and without doing any work in the background. We use essential cookies to perform essential website functions, e.g. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. You can use Mapillary to locate speed limit signs. Change maxspeed=120 to maxspeed=100. Then I suggest to move over to the Overpass API repo to ensure that the relevant parts are easy to find on both sides. That doesn't really match today's architecture, where load is distributed using DNS round robin, i.e. A 503 could be used during maintenance also with a Retry-After HTTP-Header. https://www.ietf.org/assignments/http-status-codes/http-status-codes.xml, this article covering rate limiting in nginx. One thing is the timeout inside a response that starts with HTTP 200. There are even signs in town that will tell you how fast your are going. Encouraging users to test their queries in Overpass Turbo (for example through a link 'Test this query in Overpass Turbo') combined with better documentation of the expected response. An actual Overpass request queue. This is perhaps less trivial than it sounds, because the MR interface is currently not built around deferred requests. Greedy scripts, in particular starting the next request once the previous has completed or failed, sending requests that are obviously pointless from a human perspective (like sequentially requesting all ways by their id, or hundreds of times the same bounding box). Learn more. 2 years ago. From the server perspective this is a burst of requests and then comparably long silence. For more information, see our Privacy Statement. requests from the same IPv4 address or the same upper 64 bit of an IPv6 address are considered to come from the same user, each user is given a share of the server time that is inverse proportionate to the number of currently active users. This is a reasonable use case that does allow for many users. currently want to dive into Python with some real world projects + connecting to the endpoint of Overpass. level 2. Varying sources report that the unofficial speed limit in Davis is 40mph everywhere. I need to extract maxspeed or all attributes for whole Canada. Editing Speed Limits during driving is quite hard. There are 500 road segments. There are two different issues involved, on top of the already mentioned rate limits. Ideas are e.g. Even a high number of requests are usually not a problem for load balancers and if you want people to write better code it is better to have them running into your rate limit right away instead of doing the limiting for them by delaying the requests. they're used to log you in. The max speed values will be interpreted as kilometers per hour by default. Please follow up this part of the discussion in that issue. I noticed that when you hit the rate limit it takes a lot of time to get the 429 Status code. I suggest to document the usage pattern here. It would be good if you add source:maxspeed=* tag too. a stream of messages encoded in json) and than I would encode the timeout message in the same way. It can be easily used in iD and JOSM. The Overpass-API enforces rate-limits. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share … Modify the speed limit for the whole road (highway). There is a lot of data hidden in this data set, full of useful labels and geographic information. there are at the moment 2 slots per IP address. #python overpass_speed.py 37.7833 -122.4167 500. maxspeed=60 or maxpseed=40 mph; OSM Wiki; The maxspeed=* tag defines the maximum legal speed limit for general traffic on a particular road, railway or waterway. Even a high number of requests are usually not a problem for load balancers and if you want people to write better code it is better to have them running into your rate limit right away instead of doing the limiting for them by delaying the requests. However, I am happy to look into a specific example if this behaviour is undesirable for a certain type of requests. In addition you could also send a Retry-After HTTP-Header to indicate how long the client should wait before doing the next request. I noticed that when you hit the rate limit it … Sign in Comment it if you want a list of all maxspeeds in the radius. That's just too expensive, and it would delay delivery of the data to the client quite a bit. Thank you for the feedback. In most cases the road Segment Needs to be cuted where the Limit starts and where it ends. In addition you could also send a Retry-After HTTP-Header to indicate how long the client should wait before doing the next request. you can immediately start two requests or run one request every 12/16 of the time in the example above. To find out if you can get it from MapKit or MKDirections, you will have to look at the documentation. I observe the following to access patterns on the server: Like with the other rate limits I am open to search for an improved algorithm. Hi Jacohend, I am trying to follow your script (I am new to python and GIS). And then select only the parts you need and change the maxspeed. The more precise I understand your pattern the better I can fit changes to the quota algorithm. Perhaps one of these already addresses parts of what you are suggesting? Last edited by Maarten Deen (2020-09-03 08:48:32). Hi @ranakhan. Have a question about this project? to your account. This is inevitable once the server has started to send data. The only thing I could think of (on the side of the overpass API) is that it could give better machine readable status information that would allow to handle errors smarter and give the status information faster. Note that some parts have 90 km/h limit. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. You can always update your selection by clicking Cookie Preferences at the bottom of the page. The following snippet will help you extract the maxspeed: I'm open to figure out how to get Maproulette's use cases running more smoothly. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. There are a lot of unmapped roads on Mapillary, but it will definitely help. So my question is: how can I modify the speed limit for all the lines that have the same Road Number (or the same nat_ref and ref tags)?In other words, I would like to apply the same maxspeed to all the lines were the nat_ref and ref tags are R0. I don't know if you delay the response on purpose or if you do some work in the background by accident. I.e. Re: Modify the speed limit for the whole road (highway) Use JOSM and to limit the amount of data you have to download, use the "Download from Overpass API" option. Include virtual project search in p/ searches. Successfully merging a pull request may close this issue. Speed limits. Thanks in advance! You can export them to Level0 editor: Export -> Data -> Level0.In Level0 you can edit up to 500 objects, so it's perfect. @Noki the Overpass-specific aspects of this are probably better handled in a ticket on the Overpass repo. When rebuilding challenges this often results in a "Too Many Requests" error message: Maproulette should have a queue for requests to the overpass api and work around the rate limits. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. For more information, see our Privacy Statement. Hello rob, I think you've framed your question too broadly. Can you please guide me, how can I extract all attributes for any way/node etc. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. The only thing I could think of (on the side of the overpass API) is that it could give better machine readable status information that would allow to handle errors smarter and give the status information faster. By using a rate limiting load balancer you could even rate-limit and balance accross multiple backend servers. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. privacy statement. I don't think changing this behavior is in any way feasible atm. Get speed limit of only one road ? Yeah, we've discussed this at length in the past already.