A device may determine driving routes and transit times for vehicles and drivers. The device may include memory and processing to determine one or more indications of desired departure times and routes for a first user and a second user of a group of users, the routes including a road segment used by the first user and the second user. The device may determine a first signal received from a computer of a first vehicle and a second signal received from a computer of a second vehicle, wherein the first signal indicates traffic associated with the first vehicle, and wherein the second signal indicates traffic associated with the second vehicle. The device may determine a first suggested departure time associated with the first user and a second suggested departure time associated with the second user The device may to send indications of the first and second suggested departure times.