California Polytechnic State University has a downloaded dataset on fatal accidents on the national highway system for the year 2007:
Data.Gov has a number of datasets on accident data by state:
The NHTSA has summary statistics for 2012 on a state ...
You can find plenty of summary data, but I have not seen any publicly available raw counter data. Here's some summaries:
Federal Highway Administration
Traffic Volume Trends is a monthly report based on hourly traffic count data reported by the States. These data are collected at approximately 4,000 continuous traffic counting locations nationwide and are ...
Not sure if my list is better (or worse), because I think it has a lot to do with Andrew's question about national/state levels. If Andrew says it's cool, I'll just have him update his answer with these links:
NCSA Publications & Data Requests
you probably want this guy:
Not sure if you need something for the entire nation, but a lot of localities publish versions of this kind of data.
OpenStreetMap hosts an open source google maps like database from which you can download all the map elements, from which you can filter all the roads according to the type of road you want. The speed limits should be tagged as described on their wiki.
review the codebooks for
nhts has day-to-day travel movement. acs has migration info
Alexa is a division of Amazon. They still have an API, but you need to access it as a paid service through AWS:
Alexa Web Information Service
Alexa Top Sites
I know that 1-2 years ago, Alexa had a free API for this on data.alexa.com. Now it returns a 404 error.
There are a few software out there that promise data from Alexa but actually they scrap the website which is illegal.
The only way I know is via Amazon web servers but it is a paid service. 0.15$/1000 requests. You can see details here AWS.
The price ...
The UK Department for Transport (DFT) provides a traffic data set for the city of London, for 2000 to 2013.
There are two main data sets:
AADF - Annual average daily flow
AADF figures give the number of vehicles that will drive on that stretch of road on an average day of the year. For information on how AADFs are ...
The exact data you are looking for is kept private as it is a competitive advantage. You have two options on getting the resolution of data you would like:
Go work for the business you would like to investigate. Freight companies are secretive about their fleet management. The first reason is to avoid having their competitors get involved and a slight fear ...
The GeoPortal Deutschland has a list of sources from which to pull GIS data.
A first stop might be Open Data
Berlin's FIS-Broker provides a pretty nice dataset. If you are not German speaking the word you are looking for: Straßenverkehrszählung or Verkehrsmengen.
In theory, the maps provided by OpenStreetMap can also include positions of traffic lights. Note: Data is most detailed in Germany, not so much in the US. (If you use the programming language R, you might want to look at the osmar package to retrieve the data.)
The National Transportation Atlas Database provides a roadway network and data to accomplish this:
NTAD Liner Notes
Highway Performance Monitoring System - This includes data for speed limits (795 MB)
National Highway Planning Network (173 MB) - This is the network used to tie data together.
National Transportation Atlas Databases 2015 - This includes ...
OpenStreetMap hosts GPS Traces that are uploaded by the community. Not all are for driving, but you can probably screen GPS tracks for total distance to find driving ones. Or screen for users that meet a criteria, like this one
Files are downloadable as GPX format, which has many libraries that support parsing and analyzing.
Bulk download of OSM's traces ...
Arlington County and Alexandria, Virginia both have a Traffic Signals dataset on their respective Open Data ArcGIS portal.
Arlington County, Virginia:
Your friend needs to identify a number of factors:
What is the diurnal curve of daily traffic within the city? The graphic below was made by a news site, it shows the amount of traffic by hour. Based on this information, your best times to travel are before 7:00, 10:00 to 13:00, and after 19:00. I could not find any diurnal curve information from the City ...
California Performance measurement system (PEMS) has 5 minute and raw sensor data, as well as many levels of aggregation: http://pems.dot.ca.gov/
EDIT: Been looking through this and it's an awesome source. The raw data is every 30 seconds on every single freeway sensor in California which leads to 10's of millions of records every day. And you can download ...
In this MIT project you can find a model about traffic prediction. Also, they mention that they took the data from Minnesota Department of Transportation. So, my guess is that if you want the data from a specific city, you have to contact with the local department.
Update (May 2019):
Check this new release: https://smoosavi.org/datasets/us_accidents. It contains more than 2.25 million traffic accident records which took place within the US, and will be periodically updated.
The following dataset is recently released and will be periodically updated: https://smoosavi.org/datasets/2019_traffic_weather_events
It covers ...
The National Institute of Statistics and Economic Studies in France has data on traffic for national highways, railways and air traffic. This is their open database on Quandl: https://www.quandl.com/data/INSEE
Just search for "traffic" within the database to see the datasets on traffic specifically. Also, when you look at each dataset, there's always a ...
TMC Location lists are not that open, but some European countries offer them up to the public.
OSM them into OSM data, you could use OSM TMC or try to reverse engineer it.
As far as decoding goes: linux flavor
I would do a google search "road signs India". I found this Wikipedia article had some clear pictures with descriptions in English. If you want Hindi or other language translation, I suspect a google image search will help.
OSM has this data, you can search for tags here.
You can read more here: Mapping Turning Lanes in OpenStreetMap, and view key turn's documentation here.
OpenStreetMap's Forum is essentially Stack Exchange for OSM, as well as OSM Slack
Does transit count as traffic?
GTFS transit feeds for most of the US can be found at Transit feeds
I'm not sure what UUID is, I'm assuming its the id for each point on that map; the data-link you specified shows the data promptly on screen after pageload.
Its the tabular data, four columns wide, depth running below the fold. UUID is one column header, looks ...
If the lot of interest is a paid lot, then you might be able to get this information from the owner.
Information from a government run lot might be possible with a Fredom of Information Act, FOIA, request.