Green: Road segments where the average speed of the traffic is around the expected free flow speed, mostly due to a small volume of cars.
Yellow: Road segments with a higher volume of cars, which would lead to an average speed that is less than the expected free flow speed.
Red: Road segments with a very high volume of cars that would lead to an average speed closer to stopping and that would reduce the distance between two (2) successive vehicles, which would have the effect of creating a queue.
Black: Road segments that are blocked, due to temporary issues such as construction sites and accidents.