An example apparatus includes an impression logger to store mobile device impressions, the mobile device impressions corresponding to usage of a mobile device application to access first media; a classifier to determine whether a first number of detections of a first service set identifier (SSID) during a first time period satisfies a detection threshold, determine whether a second SSID was detected for a second time period that satisfies a time threshold, increment a counter when the detection threshold and the time threshold are satisfied, classify the first SSID as a vehicle SSID when the counter satisfies a quantity threshold; a logic circuit to, when the first SSID is a vehicle SSID, determine that at least one of the mobile device impressions occurred while the mobile device was in a vehicle.