Measuring traffic speed in a road network

A computer-implemented process comprising:

• receiving sample data associating speed of sampled vehicles on road segments to points of time in a plurality of time slots, the sample data being derived from location data received from sensors that provide location data over time of the sampled vehicles;
• accessing correlation data defining correlations among road segments and correlations among time slots;
• and
• processing the sample data using the correlation data to provide an output describing, for each road segment in the road network, at least an average vehicle speed for each road segment in the road network for at least the current time slot.

An article of manufacture, comprising:

• one or more computer storage media comprising at least one of a memory device and a storage device;
• computer program instructions stored on the one or more computer storage media which, when processed by a computer, configure the computer to implement a process, comprising:
• receiving sample data associating speed of sampled vehicles on road segments to points of time in a plurality of time slots, the sample data being derived from location data received from sensors that provide location data over time of the sampled vehicles;
• accessing correlation data defining correlations among road segments and correlations among time slots;
• and
• processing the sample data using the correlation data to provide an output describing, for each road segment in the road network, at least an average vehicle speed for each road segment in the road network for at least the current time slot.