Upper Valley road graph
Contains OpenStreetMap data, © OpenStreetMap contributors.
Source database and derived graph licensed under ODbL 1.0.
https://www.openstreetmap.org/copyright
https://opendatacommons.org/licenses/odbl/1-0/

Geofabrik New Hampshire and Vermont extracts retrieved 2026-11-11.
https://download.geofabrik.de/north-america/us/new-hampshire.html
https://download.geofabrik.de/north-america/us/vermont.html
Download the derived graph: /routing/upper-valley-v1.bin

This graph supports rough drive times, not turn-by-turn navigation.
It contains car-accessible roads within 45 km of Hanover. Travel time uses
road-class speeds, mapped speed limits and unpaved surfaces. It accounts for
one-way roads, roundabouts and simple via-node turn restrictions.
It does not incorporate traffic, temporary closures, signals, or conditional
or multi-way turn restrictions. Points snap to a nearby road within 300 m.
To rebuild, run scripts/build-road-graph.py with the two extracts.