How insert traffic to graphhopper

I want to calculate the route between source and destination by considering the traffic of roads.
So i have a question:
1- how can insert the traffic to graphhopper and is there any specified structure for traffic information?

Best Regards

As i read the “graphhopper-traffic-data-integration” module, and read the traffic.json file, i saw you change the speed by new value,
but i can not find how you determine this new value for speed?
what is your source traffic information file?
I want to create my traffic information file or get it from other resource that providing this information
so i need your kind assistance to help me to create the datafeed file for my graph.

Best regards

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