
Cyber-Physical System for Transportation Applications ◾ 249
gathered from 25 vehicles. ey used a custom app along with in-vehicle computers to gather and
transmit the data.
VTrack uses GPS and WiFi position sensors and runs a travel time estimation algorithm; how
this works is it takes noisy position samples and uses those to determine the road the user is on,
calculating the estimated travel time on roads. And the estimates made are then used to determine
hotspots and route planning.
VTrack will not always be able to rely on GPS because of problems such as consuming too
much cell phone battery power. With this known, VTrack can also operate ...