Machine-to-machine communication will outnumber human subscribers by a huge factor soon.
I like this one, maybe ubiquitous in our cities someday.
Load-Volume Tracking (LoVoTrack)
ultrasonic sensors, mobile comm and satnav to obtain information on the space available in trucks and containers.‘We installed sensors on the ceiling of each container that continuously monitor the available empty space. This information, together with the precise location of the truck, is transmitted via a cellular phone network to a central server that follows the whole fleet….
Relatively easy to insert freight when space is available.