Highway: MA 1A (Sumner Tunnel)
MA 1A (Sumner Tunnel), a limited-access highway (2 lanes, posted 35 mph), passes 2 ft to the SE of the sampled point. Highways of this class carry steady traffic day and night.
Source: OpenStreetMap road network (© OpenStreetMap contributors, via Geofabrik) · retrieved Jul 16, 2026