1. A method comprising: receiving a plurality of vehicle environment inputs, the inputs comprising a position in two dimensions for each of a plurality of objects located around a vehicle, each object located in one of four quadrants surrounding the vehicle; determining an object risk value for each of the objects by applying a set of rules to each of the objects, at least a plurality of the object risk values being non-zero, indicating the objects pose a risk to the vehicle; aggregating the object risk values by quadrant to generate a set of quadrant risk values comprising a front risk value, a back risk value, a left risk value, and a right risk value, at least one of the quadrant risk values determined by aggregating the plurality of non-zero object risk values; and controlling a driver assistance system of the vehicle based on the quadrant risks.