GraphHopper is a fast and memory efficient Java road routing engine released under Apache License 2.0. Per default it uses OpenStreetMap data but can import other data sources.

This is a fork created by Tushar Chandra in December 2017. See my own routing repository for an explanation of this research project.

This fork includes the following classes:

com.graphhopper.routing.weighting.TrafficWeighting.java - implements the custom edge weighting based on traffic data.

com.graphhopper.reader.osm.AlternativeRoutingExternalities.java - depending on arguments provided, either starts map matching from Google Maps paths (which are sequences of arbitrary lat/lon points) to GraphHopper nodes, or starts traffic based routing, or starts default fastest path routing.

I had luck running this file using the following:

java -Xmx1500 -Xms1500m -d64 -cp "reader-osm/target/graphhopper-reader-osm-0.8-SNAPSHOT-jar-with-dependencies.jar;map-matching/hmm-lib/target/hmm-lib-1.0.0-jar-with-dependencies.jar" com.graphhopper.reader.osm.AlternativeRoutingExternalities traffic

The last word can be either matching, traffic, or default.

To debug on Windows (because this was difficult for me to figure out), run the following in two different command windows:

java -Xmx1500m -Xms1500m -d64 -cp "reader-osm/target/graphhopper-reader-osm-0.8-SNAPSHOT-jar-with-dependencies.jar;map-matching/hmm-lib/target/hmm-lib-1.0.0-jar-with-dependencies.jar" -Xdebug -Xrunjdwp:transport=dt_socket,server=y,address=6000 com.graphhopper.reader.osm.AlternativeRoutingExternalities traffic

jdb -connect com.sun.jdi.SocketAttach:port=6000

and then follow usual JDB procedures.