open traffic datasets
- Caltrans Performance Measurement System (PeMS)
Caltrans PeMS is a software tool designed specifically for Caltrans. It is the centralized repository for all of Caltrans’ real-time traffic data, enabling easy access to these data that might otherwise be dispersed across multiple districts and more difficult to obtain. - Seattle Inductive Loop Detector Dataset V.1 (2015)
The data is collected by the inductive loop detectors deployed on freeways in Seattle area. The freeways contains I-5, I-405, I-90, and SR-520, shown in the above picture. This dataset contains spatio-temporal speed information of the freeway system. In the picture, each blue icon demonstrates loop detectors at a milepost. The speed information at a milepost is averaged from multiple loop detectors on the mainlanes in a same direction at the specific milepost. The time interal of the dataset is 5-minute. - OpenITS: OpenData
OpenData模块的主要目标是建立多源异构交通大数据的数据资源描述、共享与应用规范与标准体系，并实现面向互联网的、开放的数据共享服务，为交通科学研究提供强大的数据支持和基础。 - FHWA
State highway agencies collect traffic volume data through both temporary traffic counting and continuous traffic counting programs and report their continuous counting data to FHWA on a monthly basis. Data listed here are reported by states following data format prescribed in FHWA's 2001 Traffic Monitoring Guide located at this page - MnDOT traffic data
RTMC *.traffic Data (Archived Loop Data) Downloads Provided by Dr. Taek M. Kwon. The data in this archive are continuously collected by the Regional Trasportation Management Center (RTMC), a division of MnDOT, at a 30-second interval from over 4,500 loop detectors located around the Twin Cities Metro freeways, seven days a week and all year round.