WIP. Experiment with urban traffic visualizations

./script/run-script script/build-test-image

Flow data reference

name value
RWS Roadways
RW Roadway
SHP Shape
FC Functional class

Jam factor reference

Color Description
Green Free flow of traffic: 0 <= JAM_FACTOR < 4
Yellow Sluggish flow of traffic: 4 <= JAM_FACTOR < 8
Red Slow flow of traffic: 8 <= JAM_FACTOR < 10
Black Traffic stopped flowing or road closed: JAM_FACTOR = 10