1. A system, comprising a computer in a vehicle, the computer comprising a processor and a memory, wherein the computer is configured to: receive one or more data collector inputs; detect an object proximate to the vehicle based on the one or more data collector inputs; determine a closure speed between the object and the vehicle; determine a change in speed of the object; compute an accountability factor based at least in part on the closure speed and the change in speed of the object; and determine whether to identify a potential incident based at least in part on the accountability factor and an incident value that is a function of at least one of the closure speed and a distance between the vehicle and the object.