Methods, computer program products, and systems are presented. The method computer program products, and systems can include, for instance: receiving request data from a first mobile UE device, the request data requesting installation of an instance of a client software installation package on the first mobile UE device; and responsively to the request data from the first mobile UE device, deploying a first instance of the client software installation package to the first mobile UE device for installation on the first mobile UE device, wherein the client software installation package is configured so that when the client software installation package is installed on a respective mobile client, the respective mobile client is operative for counting of crossings of the respective mobile client with one or more neighboring mobile client during performance of a trip.