, Subdivision D, NL in 2010
Phase I, upgrading Labrador West to Happy Valley-Goose Bay The original TLH from Labrador West (Labrador City/Wabush) to Happy Valley-Goose Bay was completed in 1992. Some sections were poorly built or in need of upgrades due to increased traffic use, particularly the section between
Churchill Falls and Happy Valley-Goose Bay. In the summer of 1999, $60 million was allocated to upgrade the highway as part of the "Labrador Transportation Initiative".
The Phase I section of the TLH began undergoing paving operations in 2009; by October 2011, a stretch of approximately leading east from Labrador West had been paved, as well approximately heading west from Goose Bay towards Churchill Falls. The entire Phase I section of the TLH was completed in 2015.
Route 510 In 1997, the
Government of Newfoundland and Labrador committed to building an extension of the TLH, connecting
Happy Valley-Goose Bay with an existing isolated road network serving coastal communities on the
Strait of Belle Isle. The impetus for this project was the federal government's desire to cut costs and remove itself from subsidizing coastal
ferry service to Labrador
outports which was being provided by the federal
Crown corporation Marine Atlantic. These federal cuts were completed in 1997, under the moniker Labrador Transportation Initiative, when an agreement was signed which saw the federal government transfer ownership and operation of two ferry vessels, along with C$340 million for extending Labrador's road network. A key component to this plan was $150 million to upgrade coastal Labrador marine services, including a newer high-capacity ferry for the
St. Barbe-
Blanc Sablon service across the
Strait of Belle Isle.
Phase II, Red Bay to Cartwright Junction Phase II of new construction, costing $130 million, began in 1999 and saw
Route 510 extended over four years from its terminus in
Red Bay northeast to the port of
Cartwright. This section was paved as far as Cartwright Junction, the unpaved remainder (to Cartwright) being designated
Highway 516.
Phase III, Cartwright Junction to Happy Valley-Goose Bay Phase III is a section of Route 510 built for $130 million south of
Lake Melville/
Hamilton Inlet to connect Cartwright Junction ( south west of Cartwright) with
Happy Valley-Goose Bay, completed sufficiently to open to traffic as a gravel road on 16 December 2009. During 2010, two permanent bridges, road surface work, signage, and guardrails were completed at a cost of $15 million. The road was then paved except for from Cartwright Junction westward to Paradise Heights (the divide between the basins of the Paradise River and the Eagle River). The remainder was completed in July 2022. ==Route 516 and supplementary routes==