Method, system, computer program and computer readable medium for generating closure data relating to closure of a stretch of navigable elements

A method for generating closure data relating to closure of a stretch of navigable elements during a target time period, wherein the stretch comprises one or more navigable elements of a network of navigable elements within a geographic area, wherein the method includes:

• identifying a set of source navigable elements of the network and a set of destination navigable elements of the network in a region around the stretch;
• generating one or more traffic flow indicators for the stretch, each traffic flow indicator being for a respective test time period in a set of one or more test time periods within the target time period, each traffic flow indicator being based on a comparison of a respective reference traffic flow measure for the stretch and a respective closure traffic flow measure for the stretch, wherein:
• (a) the reference traffic flow measure is indicative of a number of first journeys during a reference time period for the test time period relative to a number of second journeys during the reference time period, and
• (b) the closure traffic flow measure is indicative of a number of first journeys during the test time period relative to a number of second journeys during the test time period,
• wherein each first journey includes movement of a respective client from a respective source navigable element to at least one navigable element of the stretch and then to a respective destination navigable element, and each second journey includes movement of a respective client from the respective source navigable element to the respective destination navigable element without a navigable element of the stretch between the source navigable element and the destination navigable element;
• and
• generating the closure data based on the one or more traffic flow indicators.