Abstract: The present invention describes techniques for identifying congestion hotspots within a navigable network within a geographic area. The hotspots are identified by obtaining positional data relating to the movement of a plurality of devices with time along navigable elements represented by segments of an electronic map, and determining, using the positional data, delay data for at least one time period for each of a plurality of the segments, wherein the delay data for a segment comprises a delay value representative of a delay experienced due to congestion by the devices when traversing a navigable element or portion thereof represented by the segment during the respective time period.