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The TTI (Travel Time Index) industry's most used evaluation index of urban congestion degree is the ratio of the actual travel time and the free flow time. The larger the value, the worse the traffic operation status, and the congestion level is generally positive. Related, other abnormal weather conditions (such as rain, snow, fog, etc.) or abnormal road conditions may also affect the value of TTI.

the basic idea of Speed: If a link has two time slices, t1 and t2, and the link's length is S, then the average speed v of the link is: v = 2·S / (t1 + t2) during the period from t1 to t2.

the basic idea of TTI: In the same link in a time slice, tti = free flow speed / actual speed.

With DiDi's advantages in big data and technology, the GAIA Initiative provides academic community with real-life application use cases, anonymized data and computing resources, and seeks collaboration with the academic community. The Initiative aims to advance fundamental and prospective studies in transportation research. It promotes the application of scientific achievements by strengthening ties between industry, university and research. This effort will drive scientific development in intelligent transportation systems and contribute to societal development.With DiDi's advantages in big data and technology, the GAIA Initiative provides academic community with real-life application use cases, anonymized data and computing resources, and seeks collaboration with the academic community. The Initiative aims to advance fundamental and prospective studies in transportation research. It promotes the application of scientific achievements by strengthening ties between industry, university and research. This effort will drive scientific development in intelligent transportation systems and contribute to societal development.

Add a realtime traffic data API in config.conf in root of host project as following.

dependencies {
    realtime_traffic_data 'http://sts.didichuxing.com/api/realtime?citycode=1&token=your token'
    roadnet 'http://sts.didichuxing.com/api/roadnet?citycode=1&token=your token'
    freeflow 'http://sts.didichuxing.com/api/freeflow?link_id=10001&token=your token'
    weight 'http://sts.didichuxing.com/api/weight?link_id=10001&token=your token'
}

In addition, you need to configure redis、mysql

g++ -o TrafficIndex CommonTools.cpp LogUlits.cpp main.cpp md5.cpp TrafficIndex.cpp traffic_pb.pb.cc -lmysqlclient -lpq -I/usr/include/mysql -L/usr/lib64/mysql -I/usr/include -L/usr/lib64 -I/usr/local/protobuf/include -L/usr/local/protobuf/lib -I/usr/local/include/hiredis -L/usr/local/lib -I/usr/local/postgresql-9.6.6/include -L/usr/local/postgresql-9.6.6/lib -I/usr/local/leveldb -luuid -lpthread -lprotobuf -lhiredis -lcurl -lleveldb

Finally, Get executable program TrafficIndex

Start the calculation program like this: nohup ./TrafficIndex &

• Only supports the data format of DIDI, other data types are not supported.
• Need to apply for open data from DIDI.

Welcome to contribute by creating issues or sending pull requests. See Contributing Guide for guidelines.

TTI is licensed under the Apache License 2.0. See the LICENSE file.