Data messages transport data exchanged between tasks at the application layer.
Sometimes vital transport data can just disappear.
There have been releases of geographic data, health service performance data and transport data.
One app, Blindsquare, helps visually impaired people to navigate the city by layering public transport data with information from Foursquare.
Policymakers used stock prices, industrial production and transport data, and little else.
We wanted to know the answer to this and brought in transport data specialists ITO World to help show the distances between people's home and the riots themselves.
The region has a legacy of under-investment, and spending is on a downward trajectory, according to Department for Transport data.
The company that brings you these maps, ELGIN, states that it exists because of the Government's vision of opening up local transport data by December 2012.
Every shop has opening times info as well as website links and phone numbers, with social media, photos and transport data pulled in too.
The internet connection needed would have to transport data at speeds up to a gigabit a second.
Transport for London, which runs the capital's buses and underground trains, made its live transport data freely available in 2011.
