I have a layer with the city streets. I have a database with traffic values, including traffic going into the city and traffic going out from the city.
I need to show the street links with different colours based on the number of vehicle going into the city (red at the right of the link) and the number of vehicles going out from the city (blue at the left of the link). I also need for the colours to be proportional based on value. Can you help me?