We should look back at the ONS data to see what they did. The cover notes on their spreadsheet say they worked in collaboration with Ordnance Survey, who have a routing network for walking, and other travel modes. In this case it doesn't look like elevation is taken into consideration. The shortest route is calculated, then a distance and walking speed of 4.8km per hour is used to calculate time (this follows 'Department for Transport Journey Time Statistics'). The libraries are defined as destinations in the analysis, so it's assessing the walking route TO the library. Presumably it would provide similar results for going back home, unless the routes were constrained by being 'one-way', which is less likely when walking.
0 commit comments