The Meteogram Soil Trafficability is indispensable if you need accurate data on the trafficability on different types of soil (sand, silty loam, silt, and clay).
The particular conditions are expressed with colours: red (1) denotes no trafficability, yellow (2) implies restricted trafficability, and green (3) means good trafficability. The black curve (4) indicates how the conditions are going to develop over time.