1. A system, comprising: a computing device that includes processor and a memory; and a sensor connected to the computing device; the memory of the computing device storing instructions executable by the processor to: identify an identified lane based on data from the sensor; select, from a host vehicle that includes the computing device and the sensor, a target vehicle in the identified lane; establish a model of the identified lane in the form of a virtual lane with the virtual lane having a virtual outer boundary line; determine that the target vehicle is departing the identified lane when a vehicle target edge based on data from the sensor crosses the virtual outer boundary line; and deselect the target vehicle after determining that the target vehicle is departing the identified lane.